overclocking suggestions

Asus P5kpl-cm motherboard
September 20, 2009 at 20:25:32
Specs: Windows XP sp3, pentium dual core e5300 4 gig ocz fatality pc 6400 ram
i have an asus p5kpl-cm mobo, pentium dual core e5300 2.6 gig proc.,4 gig ocz fatality pc 644 ram. radeon 4670 video card.enermax 405 tomahawk psu.windows xp sp3.also have arctic freezer cpu cooler. had 2 1 gig sticks of pc6400 ram before switching to the 2 gig sticks. now the 4 gigs of ram wont let me overclock as well as the 2 gigs did.ram is 5-5-5-15. cannot chose ram dividers on limited mobo.used to get 3.4 gig stable with 2 gig ram but now i can only get 3.0 gig stable with 4 gig ram.should i get a better mobo? any tips on settings would be much appreciated.thank you. nick244888

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September 20, 2009 at 20:58:37
Set AI overclocking to Manual. Set the CPU frequency at 400MHz (1600MHz FSB), set the CPU multi at 8x. Set the RAM at 800MHz & make sure the RAM voltage is set correctly, probably 2.2v? Lock the PCIe at 100MHz, disable any spread spectrum settings & make sure EIST is disabled. Increase CPU voltage as necessary.

If you can pull it off, the CPU will run at 3.2GHz/1600MHz FSB with the CPU:DRAM ratio at 1:1.

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September 20, 2009 at 23:43:13
But if you didn't you end up burning your board. But still it depends if you apply it correctly then you will run a good over clocked computer but be aware that you'll be risking it from over heat.

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September 21, 2009 at 05:19:29
The board is capable of 1600MHz FSB (400MHz), the RAM is capable of 800MHz DDR (400MHz) & the CPU is thermally protected. The risk factor is minimal.

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September 21, 2009 at 14:24:55
tried recommended settings but it would not boot up. any other thoughts? this mobo will not let me lock pcie at 100 mhz. no such setting.gave it a shot. i can only adjust fsb up to 400. ram timings are adjustable and ram 667,800 or auto.cpu x 13x or less. like i said i tied your recommendation s. the pc would turn on but wouldnt boot to xp.had to flash bios. maybe a better mobo?thanks.

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September 21, 2009 at 18:07:09
All we can do is offer suggestions & try to give you some insight into overclocking theory, but it's up to you to implement it. It probably didn't hurt, but as far as I can tell, you didn't have to flash the BIOS.

I just downloaded your motherboard manual & looked thru the BIOS chapter. And YES, you CAN lock the PCI-e at 100MHz. As soon as you switch AI Overclocking to Manual, the additional settings for CPU frequency, PCI-e frequency & DRAM frequency will become available. The CPU Ratio Adjustment also has to be set to Manual, then you can change setting by using the + or - keys.

One thing I neglected to say (because I thought you knew) was that you should NOT make changes in huge leaps...you should always do it a little at a time & test for stability after you make changes. You also need to check to see what happens to the RAM frequency when you change the CPU frequency. For that you'll need a program such as CPUZ.

BTW, in case you didn't know, for the CPU, 400MHz freq = 1600MHz FSB (QDR). For the RAM, 400MHz freq = 800MHz (DDR).

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September 21, 2009 at 18:45:17
changed overclock profile to manual and there is no pci-e setting.all i have to work with are the other settings.cannot set cpu x to manual. it stays on auto.but i can hit number 8 and the x goes from thirteen to 8.if its actually 8 x. got as high as 230 cpu x 13 multiplier for 2.99 gig or 3 gig with ram set to auto. anytime i go above 230 with 13x it wont boot or hard locks causing me to pop out the battery to reset.been through the bios settings a million times in past few months.very limited oc options.

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September 21, 2009 at 19:31:30
just browsed my mobo manual.the pics in my manual show them using a different cpu. most of the options for changing settings are totally different than what my bios shows for my cpu. the manual says the bios would detect and show the options according to the cpu installed.so depending on the manual is no good considering most of the settings shown in the manual do not apply to my processor.weird? thanks anyway!

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September 21, 2009 at 23:06:17
Well you can reconsider on buying a new computer instead of over clocking that one and expecting it to worn out later on.

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September 24, 2009 at 06:31:18
"changed overclock profile to manual"

You shouldn't be using the profile settings at all. You have to disable AI overclocking altogether...once you do that, the other settings will magically appear. It has nothing to do with which CPU you have installed.

And you need to realize that the faster the FSB, the better the performance. 8 x 400MHz will perform MUCH better than say 13 x 246MHz, even though both run run the CPU at 3.2GHz.

" i can hit number 8 and the x goes from thirteen to 8.if its actually 8 x"

Apparently you don't even know if the multiplier is changing? That is why you need to run CPUZ to confirm your settings. And you have to make sure that you're not over-overclocking the RAM.

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September 24, 2009 at 08:07:35
OK, I did some digging & it appears that the memory setting is probably the major thing that's holding you back, plus you haven't mentioned anything about changing any voltages? The voltage settings aren't listed clearly. Here's what I've found:

1.8V Dual Over Voltage = RAM voltage
1.5V Over Voltage = PCIe voltage
VTT_CPU Over Voltage = CPU voltage
1.25V Over Voltage = northbridge chipset voltage

The only ones you should need to play with are the RAM voltage & CPU voltage. Do you know what your RAM voltage is supposed to be? The JEDEC standard sets the default voltage for DDR2-800 at 1.8v. However, the majority of RAM manufacturer's do not conform to the standard. Find out what your RAM voltage is supposed to be & change the 1.8V setting from AUTO to the closest setting available.

Do the same with your CPU voltage setting. I believe the default for your CPU is 1.24v? Go to the Hardware Monitor menu & see what the VCORE Voltage is listed as. Assuming it is 1.24v (or thereabouts), change the VTT_CPU setting from AUTO to 1.3v.

Also, as long as you choose one of the standard CPU frequencies (200, 266, 333, 400), the PCIe will run at it's default speed of 100MHz.

After doing the above, try the following as an experiment:

Under Advanced > JumperFree Config:

AI Overclocking = Manual
CPU Freq = 333
DRAM Freq = 667

Under Advanced > CPU Config:

CPU ratio = 8
CE1 support = disabled
Max CPUID Value = disabled
Vanderpool Tech = disabled
CPU TM = enabled
Execute Disable Bit = enabled
Intel SpeedStep = disabled

Make sure to "Exit & Save Changes".

If the above settings work (& I did my math correctly), the CPU will run at 2.67GHz with the FSB at 1333MHz & I *think* the RAM speed will be approx 417MHz (DDR834).

Remember, this is just an experiement. Use CPUZ to confirm the settings.


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September 24, 2009 at 15:55:16
set everything as suggested. triple checked everything. got and overclock failed and or overvolt failed. would not boot. i have been using it with cpu freg. at 230 with 13 x multiplier for 2.99 gig. any higher than 230 and wont boot. it seems to bottleneck though. could adjusting ram timings help. appreciate the help.this mobo doesnt seem to overclock to well according to some forums. i had 3.4 with only 2 gig of transcend ram but i cant go over 3 gig with my 4 gig of ocz fatality. supposed to be good ram. ocz has it at 2.1 volts.

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September 24, 2009 at 16:53:38
Without using CPUZ & posting the results, I'm flying blind.

I just ran thru all the above responses to check all that was covered. In response 4 you said you had to flash the BIOS. That means you're running Version 0608, right?

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September 24, 2009 at 19:10:04
0608 bios correct. ran cpuz. the way i have it now is cpu freq at 230 with a 13 x multiplier for 3.0 gig.i added some voltage to ram and cpu at these settings and it seems to work ok now cpu z shows ram timings at 6-6-6-18. with dram freg at 462 mhz,fsb:dram at 1:2. cpu core voltage is 1.2. when idle the cpu underclocks to 1.3 gig using a 6x multipier. power saving i guess.cpu is an e5300 dual core wolfdale 45nm core voltage 1.2,stepping a, revision ro if this helps. its like the motherboard doesnt like high cpu frequencies.

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September 24, 2009 at 20:19:01
"when idle the cpu underclocks to 1.3 gig using a 6x multipier. power saving i guess"

What that means is you still have SpeedStep enabled. What it also means is you aren't following my directions.

"with dram freg at 462 mhz"

The fact that your RAM is running at 462MHz also confirms that you aren't following my directions. The reason you can't raise the CPU frequency any higher than 230MHz is because the RAM is holding you back.

Try this as another experiment. Leave all your settings exactly as they are except for the RAM. I don't know if you have it set to AUTO or 800MHz, but lower it to 667MHz, save your settings, boot into Windows, then check CPUZ. The RAM speed *should* be approx 385MHz. If that's correct, it *should* allow you to raise the CPU frequency to at least 250MHz, probably higher.

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September 25, 2009 at 05:54:05
set ram at 667 and cpu frequency at 240. gets 3.1gigs at these settings. ram timings are now 6-5-5-15 which are ram factory specs. curiuosly when i disable speed step it automatically goes back to enable the next time i check out bios.ram speed is 401mhz. could i go farther with cpu frequency or just leave it. dont want to risk frying anything.so what i have now is cpu voltage at intel spec ,ram voltage is at ocz spec, cpu frequency at 240,ram at 667 with stock 6-5-5-15 timings and ram speed at 401mhz. works good. ran crysis benchmark, no problems so far.thanks.

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September 25, 2009 at 07:20:12
I don't know why SpeedStep is re-enabling but your current settings are working as I expected. The RAM setting was the problem all along. Setting it to 667MHz took the RAM out of the picture & allowed higher CPU frequency settings. Is it possible to set the RAM lower than 667MHz? Is 533MHz an option??

From your previous attempts, you know your RAM is capable of 462MHz, so that means you *should* be able to increase the CPU frequency even higher than 240MHz. If you keep the RAM setting at 667MHz, here's what the RAM speed *should* be at different CPU frequencies:

250 CPU freq = 417 RAM freq

260 CPU freq = 433 RAM freq

270 CPU freq = 450 RAM freq

280 CPU freq = 467 RAM freq

Based on the above, the max CPU freq without over-overclocking the RAM falls between 270 & 280MHz. If you decide to try overclocking higher than your current 240MHz setting, don't jump straight to 270MHz. Make your increases in increments of 5-10MHz at a time. You may end up hitting a wall somewhere between 240 & 270MHz. But since you know your CPU is capable of at least 3.4GHz, you *should* be able to get up to at least 260MHz.

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September 25, 2009 at 13:01:30
only have 667, 800 and auto for ram settings. upped cpu frequency to 245 with 13x multilier. now have 3.2 gigs. not bad from 2.6. you say that a lower multiplier and a higher cpu frequency would run faster. ill give it a shot. what settings do you recommend.i thougt the board didnt like high cpu frequencies but with ram at 667 and higher cpu and ram voltages i already have it above the 230 cpu frequency max from before. finally got my head around all the numbers. you have been the most help by far. its nice when someone really knows what they are talking about. do you think a multilier of 10 and a cpu frequency of say 320 would work. that would give me 3.2 gig. worried about the high cpu frequency but after upping the voltages it might work. thoughts?

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September 25, 2009 at 14:01:51
hate to keep picking your brain but i have one more question.my pc and graphics card are dx10 compatable but xp is not. so would i gain performance both graphically and cpu(speed) if i switch to xp64 bit,64vista or 64win7.thanks for all your help and patience.

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September 25, 2009 at 15:09:42
"do you think a multilier of 10 and a cpu frequency of say 320 would work"

Because of the RAM settings (or lack of), the max CPU freq will still fall between 270-280MHz regardless of the multiplier.

"would i gain performance both graphically and cpu(speed) if i switch to xp64 bit,64vista or 64win7"

You'd most likely lose performance with Vista or Win7 because their system requirements are higher than XP's. You'd gain full use of your RAM with XP 64 though. Just out of curiousity, how much of your 4GB is actually recognized by XP SP3?

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September 25, 2009 at 19:49:34
xp recognized 3.5 gig of ram.for the heck of it i installed vista ultimate. it recognized all 4 gigs. turned off the usual junk in vista and it runs quite well. actually call of juarez bound in blood runs noticebly smoother on vista. maybe its because its using all my ram. going to try farcry2 and crysis next. pc runs noticebly better at 3.2gig over stock 2.6gig.

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September 25, 2009 at 22:54:18
Those game u mentioned run smoother on vista because of dx10,and u will disappointed with crysis when playing in vista(already tryit) because crysis is not truly dx10 game

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September 25, 2009 at 23:12:10
When choosing os go 4 win 7 because win vista has higher requirements than win 7,(i run win 7 and win vista in p4 1.7ghz 512mb of ram and with onboard video, win 7 run smoother than win vista) but with your system specs u can run both os maximum

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September 26, 2009 at 06:43:00
tried all operating systems on my pc. windows 7 rc was quite good but i had to get rid of it because it kept giving me some kind of port forwarding problem not letting me download anything. i would still be using it except for that.. by the way my overclock to 3.2 gigs works great and asus probe shows temps are well within specs. thanks for the help.

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