Yes DDR400Mhz and DDR533Mhz will not run at the same it stated. It will run at 333Mhz or your system will not boot because of the memory. CL doesn't mean Clock Lag, jam just gives you an example. CL 2.5 is better because its more stable, if you set CL 2.0 your computer may not function properly or will crash from time to time. Pentium 4 3.6Ghz Prescott Asus P5WD2 Premium Corsair XMS 2Gig DDR2 667Mhz X700Pro 256MB GDDR3 WD Raptor 36.7GB WD 250GB 16MB SATA II Coolermaster 430Watt I don't have a case, yet I enjoy not having one

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ok great,now its more clear to me,but I hope you don't mind me asking just 1 more question... Can I have on my board two memories, one would be 1gb DDR 333Mhz and the other would be 256mb 333Mhz,so in total it would be 1.256gb ? or would it be a problem ?

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All depends on your motherboard. If you have the motherboard documentation, look at the memory selection and see what's the max module can be (if 1gig then it’s ok). If you don’t have the motherboard documentation then just Sandra to find out the motherboard model and look for the manufacture’s website to find out what’s the maximum size it supports. IMO 2 x 512MB will do the job. Pentium 4 3.6Ghz Prescott Asus P5WD2 Premium Corsair XMS 2Gig DDR2 667Mhz X700Pro 256MB GDDR3 WD Raptor 36.7GB WD 250GB 16MB SATA II Coolermaster 430Watt I don't have a case, yet I enjoy not having one

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I'm not sure if you understood my question properly or maybe I didnt understood yours... I didn't mean about the maximum size that every slot could support (but now that we mentioned it,is that could be a problem too ?), but I meant if that's a problem to have one memory of 512Mb or 1Gb while the other memory (on the next slot) would be as an other size as 256Mb ? here are the results... SiSoftware Sandra Mainboard Manufacturer : Gigabyte Technology Co., Ltd. MP Support : 2 Processor(s) MPS Version : 1.40 Model : GA-8ST800 Version : 1.x System BIOS : 02/14/2003-SiS-646-6A6IXG0XC-00 Chipset : SiS 64X/65X System Memory Controller Location : Mainboard Error Correction Capability : None Number of Memory Slots : 3 Maximum Installable Memory : 3GB Bank0/1 - A0 : None None None None DIMM 256MB/64 Bank2/3 - A1 : Empty Bank4/5 - A2 : Empty Chipset 1 Model : Silicon Integrated Systems (SiS) SiS645DX CPU to PCI Bridge Bus(es) : AGP PCI USB i2c/SMBus Front Side Bus Speed : 4x 134MHz (536MHz data rate) Maximum FSB Speed / Max Memory Speed : 4x 133MHz / 2x 166MHz Width : 64-bit SMP - MP Capability : No IO Queue Depth : 8 request(s) Priority Master Queue Depth : 7 request(s) Chipset 1 Hub Interface Type : MUTOL Width : 16-bit Full Duplex : No Multiplier : 2/1x Logical/Chipset 1 Memory Banks Bank 0 : 256MB DDR-SDRAM 2.5-3-3-7 1CMD Channels : 1 Width : 64-bit Refresh Rate : 7.80µs Power Save Mode : No Fixed Hole Present : No Environment Monitor 1 Model : ITE IT8705F LPC Version : 2.00 Mainboard Specific Support : No Temperature Sensor(s) Board Temperature : 44.0°C / 111.2°F CPU1 Temperature : 25.0°C / 77.0°F CPU2 Temperature : 37.0°C / 98.6°F td Cooling Device(s) Auto Fan Speed Control : No Chassis Fan Speed : 3590rpm Voltage Sensor(s) CPU1 Voltage : 1.52V CPU2 Voltage : 1.92V +3.3V Voltage : 3.31V +5V Voltage : 5.16V +12V Voltage : 11.92V -12V Voltage : -11.95V -5V Voltage : -5.31V Standby Voltage : 5.00V AGP Bus(es) on Hub 1 Version : 2.00 Speed : 4x Fast-Writes Enabled : Yes Side Band Enabled : No Side Band Support : Yes Aperture Size : 64MB PCI Bus(es) on Hub 1 Version : 2.10 Number of Bridges : 1 PCI Bus 0 : PCI (1/1x PCIClk) LPC Hub Controller 1 Model : Silicon Integrated Systems (SiS) SiS PCI to ISA Bridge (LPC Bridge) ACPI Power Management Enabled : Yes Multiplier : 1/4x USB Controller 1 Model : Silicon Integrated Systems (SiS) SiS5597/8 Universal Serial Bus Controller Version : 1.00 Interface : OHCI Channels : 2 Supported Speed(s) : Low (1.5Mbps) Full (12Mbps) Legacy Emulation Enabled : No USB Controller 2 Model : Silicon Integrated Systems (SiS) SiS5597/8 Universal Serial Bus Controller Version : 1.00 Interface : OHCI Channels : 2 Supported Speed(s) : Low (1.5Mbps) Full (12Mbps) Legacy Emulation Enabled : No USB Controller 3 Model : Silicon Integrated Systems (SiS) SiS5597/8 Universal Serial Bus Controller Version : 1.00 Interface : OHCI Channels : 2 Supported Speed(s) : Low (1.5Mbps) Full (12Mbps) Legacy Emulation Enabled : No USB Controller 4 Model : Giga-Byte Technology SiS7002 USB 2.0 Enhanced Controller Version : 2.00 Specification : 1.00 Interface : EHCI Channels : 6 Companion Controllers : 3 Supported Speed(s) : Low (1.5Mbps) Full (12Mbps) High (480Mbps) Addressing Support : 32-bit Legacy Emulation Enabled : No System SMBus Controller 1 Model : SiS 5595 Internal SMBus Advanced TCO Mode Enabled : No Slave Device Enabled : No PEC Support : No Expansion Slot(s) PCI (9h) : PCI 32-bit +5V +3.3V PME Full-Length Available PCI (Ah) : PCI 32-bit +5V +3.3V PME Full-Length Available PCI (Bh) : PCI 32-bit +5V +3.3V PME Full-Length Available PCI (Ch) : PCI 32-bit +5V +3.3V PME Full-Length Available PCI (Dh) : PCI 32-bit +5V +3.3V PME Full-Length Available AGP (8h) : AGP 32-bit +5V Full-Length Used (Nvidia Corp GeForce4 MX 440 [NV17.2]) Port Connector PRIMARY IDE : None - ATA / None SECONDARY IDE : None - ATA / None FDD : 8251 FIFO - Floppy Disk / None COM1 : Serial Port 16450 - 9 Pin Dual Inline / DB-9 pin male COM2 : Serial Port 16450 - 9 Pin Dual Inline / DB-9 pin male LPT1 : Parallel Port ECP/EPP - DB-25 pin female / DB-25 pin female Keyboard : Keyboard - None / PS/2 PS/2 Mouse - No Detected : Mouse - PS/2 / PS/2 USB : USB - None / None Performance Tips Warning 2533 : Disabled host controllers are present. Check BIOS settings. Tip 2532 : Consider adding more CPUs for better utilisation. Notice 224 : SMBIOS/DMI information may be inaccurate. Tip 2511 : Some memory slots are free so the memory can be easily upgraded. Warning 100 : Large memory sizes should be made of Registered/Buffered memory. Warning 2540 : No APIC detected for MP system. Tip 2 : Double-click tip or press Enter while a tip is selected for more information about the tip.

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Ok looks good, your motherboard can support up to 1gig Module memory. And Yes to your question, you can mix memory size since this motherboard does not support duel channel mode. Pentium 4 3.6Ghz Prescott Asus P5WD2 Premium Corsair XMS 2Gig DDR2 667Mhz X700Pro 256MB GDDR3 WD Raptor 36.7GB WD 250GB 16MB SATA II Coolermaster 430Watt I don't have a case, yet I enjoy not having one

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yeay great :) but wait... (sorry for the mass), if one memory is CL 2.5 and the other is CL 3, or if one memory is 333Mhz and the other is 266Mhz (am not sure if it supports on my board, but lets say it is for the question) it still won't be an issue ? and the mix won't make any harm ?

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You won't have any issue beside they will both run at CL 2.5 and 266Mhz to match the speed for one and the other. So you will lose the speed on the 333Mhz and runs at 266Mhz. Pretty bad isn't it? Pentium 4 3.6Ghz Prescott Asus P5WD2 Premium Corsair XMS 2Gig DDR2 667Mhz X700Pro 256MB GDDR3 WD Raptor 36.7GB WD 250GB 16MB SATA II Coolermaster 430Watt I don't have a case, yet I enjoy not having one

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haha, well if you say that they both run at CL 2.5 and 266Mhz,well in one hand its a shame for the 266Mhz thing,but it's better to run at CL 2.5 according to what you and Jam said before, no ? p.s. how can I find what CL is my current memory.. ? sandra didn't mentioned anything about this,actually sandra didn't mention something essential of the card...

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CPUZ should be able to supply your RAM info: http://www.cpuid.com/cpuz.php Just to clarify...the reason CL 2.5 RAM is the best buy is because it's usually no more expensive than CL 3.0, but it performs better. On the other hand, CL 2.0 RAM is usually much more expensive & the minor increase in performance really isn't justifiable, unless you're building a killer rig running all the best of the best components.

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My suggestion is just buy 2 x 512MB DDR333Mhz and put your 256MB away. You will not notice the difference between CL2 and CL3. On the other hand AMD's performance can gain a lot from CL3 to CL2 because they have an build-in memory controller on their CPU. But this is not the case for you. Pentium 4 3.6Ghz Prescott Asus P5WD2 Premium Corsair XMS 2Gig DDR2 667Mhz X700Pro 256MB GDDR3 WD Raptor 36.7GB WD 250GB 16MB SATA II Coolermaster 430Watt I don't have a case, yet I enjoy not having one

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great, it says : cas latency 2.5 clocks ras to cas 3.0 clocks ok, so now the last two question,then I won't bother you guys (hopefully) anymore,its late too in here... 1. what do you recommend ? to buy 2X512MB or only one of 1Gb ? 2. how do you guys know all this stuff,where did you learn this :) ?

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It really doesn't matter at this point, maybe go for the cheaper one. Your motherboard does not support duel channel so either one won't benefit you. And CPU-z should also tells you bout FSB:DRAM, CAS, CAS to RAS, RAS precharge and cycle time, I am assuming its 2.5-3-3-8? for FSB:DRAM the best ratio should be 1:1. By the way, are you an Overclocker? I learned all these stuff from testing and input froms other users. : ) (I burnt my own Pentium MMX, HAHAHAH) Pentium 4 3.6Ghz Prescott Asus P5WD2 Premium Corsair XMS 2Gig DDR2 667Mhz X700Pro 256MB GDDR3 WD Raptor 36.7GB WD 250GB 16MB SATA II Coolermaster 430Watt I don't have a case, yet I enjoy not having one

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This is pretty funny....why didn't you just go to crucial.com and use their system analyzer to recommend the best ram for you? 17 responses is pretty extensive...LOL Hopefully my advice will help you...Please post back with your results....thanks

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"Your motherboard does not support duel channel so either one won't benefit you." hmm.. what does duel channel means really ?

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When a computer is running at Duel Channel Mode, it doubles the bandwidth of the memory. For a system to run Duel Channel, the motherboard has to support it and you should use two identical memories (same brand, memory size, CAS, etc...) Pentium 4 3.6Ghz Prescott Asus P5WD2 Premium Corsair XMS 2Gig DDR2 667Mhz X700Pro 256MB GDDR3 WD Raptor 36.7GB WD 250GB 16MB SATA II Coolermaster 430Watt I don't have a case, yet I enjoy not having one

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Great ! :) so now I can sleep tight after this wonderful interesting discussion. XpUser4Real, you're absolutely right,I said a few times that my next question would be the last one,but since both Death_Knight and Jam,are such smart,experienced and nice guys,and on every answer of them they specified me another detail and another one which I'm not common with,the I had to ask another question,it really interests me,and im a curious guy :P Death_Knight and Jam, nice job,thank you soooo much,you've been really a MAJOR help for me,I really appreciate this,at the time come,god will remember your help here,you're doing a great Mitzvah :D final words : Thank you thank you and again thank you,for your time,help and patience for me :)

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hummiz You're welcome, it's very pleasant to share knowledges with others, and that's how others will absorb. Remember all pros was once a rookie : ) Pentium 4 3.6Ghz Prescott Asus P5WD2 Premium Corsair XMS 2Gig DDR2 667Mhz X700Pro 256MB GDDR3 WD Raptor 36.7GB WD 250GB 16MB SATA II Coolermaster 430Watt I don't have a case, yet I enjoy not having one

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haha,have to agree on that :) thanks again,nighty night :D

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"For a system to run Duel Channel, the motherboard has to support it and you should use two identical memories (same brand, memory size, CAS, etc...)" No you DO NOT, my friend.....;-) When Google isn't your best pal

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How so Sabertooth? All motherboard manufacture suggest user to use two identical memory for duel channel. Pentium 4 3.6Ghz Prescott Asus P5WD2 Premium Corsair XMS 2Gig DDR2 667Mhz X700Pro 256MB GDDR3 WD Raptor 36.7GB WD 250GB 16MB SATA II Coolermaster 430Watt I don't have a case, yet I enjoy not having one

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I have said this way too many times, you DO NOT need to have 100% identical memory sticks to run in dual channel mode, that is a feature of the motherboard and NOT the memory modules themselves (RAM). While it may be the ideal to do that, it is not a fundamental criteria. Heck, the sticks do not even have to be of the same size or manufacturer,but you definitely want sticks of the same speed.

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"When a computer is running at Duel Channel Mode, it doubles the bandwidth of the memory. For a system to run Duel Channel, the motherboard has to support it and you should use two identical memories (same brand, memory size, CAS, etc...)" That was why I said should its a suggestion Sabertooh, I did not say must. There's a difference between should and must Pentium 4 3.6Ghz Prescott Asus P5WD2 Premium Corsair XMS 2Gig DDR2 667Mhz X700Pro 256MB GDDR3 WD Raptor 36.7GB WD 250GB 16MB SATA II Coolermaster 430Watt I don't have a case, yet I enjoy not having one

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"if one memory is CL 2.5 and the other is CL 3, or if one memory is 333Mhz and the other is 266Mhz (am not sure if it supports on my board, but lets say it is for the question)" "You won't have any issue beside they will both run at CL 2.5 and 266Mhz to match the speed for one and the other. So you will lose the speed on the 333Mhz and runs at 266Mhz." The memory would run at CL3 and 266Mhz. Both chips would have to step down to the lower speeds of the other. The CL3 mem can not step up to CL2.5.

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Ya that's what I really meant, I made a typo on that because I was thinking about frequency while typing CL lol, thanks for pointing that out. Since we know that CL3 is slower than CL2.5 Pentium 4 3.6Ghz Prescott Asus P5WD2 Premium Corsair XMS 2Gig DDR2 667Mhz X700Pro 256MB GDDR3 WD Raptor 36.7GB WD 250GB 16MB SATA II Coolermaster 430Watt I don't have a case, yet I enjoy not having one

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"The CL3 mem can not step up to CL2.5" It *might* be able to if you configure the settings manually. For instance, I'm currently running Kingston ValueRam with default timings of 3-4-4-8 at 2.5-3-3-7. But if you have your RAM settings on AUTO, it will always configure to the lowest/slowest settings of the lowest/slowest stick of RAM being used. Here's some info on dual channel: http://www.kingston.com/newtech/MKF_520DDRwhitepaper.pdf

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and the saga continues...LOL Hopefully my advice will help you...Please post back with your results....thanks

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I guess I have to be pedantic on this one. "For a system to run Duel Channel, the motherboard has to support it and you should use two identical memories (same brand, memory size, CAS, etc...)" When you are speaking English the words you stress can change the underlying meaning a sentence, for example: "For me to accept your job offer, I should be paid twice that salary" As you can tell from above, I am asking for a higher pay in order for me to consider the position being offered as opposed to simply suggesting because the word should and its context is used to talk about obligation and duty as an alternative to 'ought to'. In other words you might as well have said to the OP: "For a system to run Duel Channel, the motherboard has to support it and you ought to use two identical memories (same brand, memory size, CAS, etc...)". Hopefully we can agree to disagree.

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