Ram Campatility ?

January 24, 2011 at 09:57:25
Specs: Windows XP, AMD Dual Core 2.6 Ghz
Hi, I'm trying to figure out what type of memory I need to upgrade my computer and online memory scans from certain sites are not giving me a clear enough idea. Currently I have 2GB of DDR2 PC-5300 667mhz and I want to upgrade it to 4GB. I only have two memory slots compatible for 16GB but only tested for 4GB according to the motherboard manufacturer. This means I'm going to have buy two sticks of 2GB. I want to purchase the new memory locally and all I see for sale of 2GB sticks is DDR2 PC 6400. This is where I get confused. I don't understand what PC 6400 is as compared to PC 5300 and if my motherboard or computer is compatible with it. I think it has to do with the processor from some of the things that I have read. Because my processor is an AMD Athlon 64 X2 5000+ 2.6Ghz I assumed that it's only compatible with PC 5300 Ram or lower and brought PC 5300 Ram. Before spending $120 + I want to be sure that I'm buying exactly the right thing.

The manual for my motherboard states exactly this

• Two 240-pin DIMM slots for DDR2 SDRAM memory modules
• Supports Dual Channel DDR2 800/667/533/400 memory bus
• Maximum installed memory is 16* GB
(* Duo to the DRAM maximum size is 2 GB at present, the memory
maximum size we have tested is 4 GB.)

This doesn't give any indication as to PC 2700, 3200, 5300 and 6400 ram etc. Basically I don't know what determines compatibility for that, the motherboard or processor; if their is even a compatibility requirement? Can somebody clear this up for me as to what are the requirements for being able to use PC 6400 Ram. Thanks

See More: Ram Campatility ?

Report •

January 24, 2011 at 10:02:25

intel P4 3.0ghz HTT
ATI 9800 Pro AGP 8x
2 x 1gb Corsair DDR400
2 x 250gb HDD
Windoze XP SP3

Report •

January 24, 2011 at 10:34:33
You currently have a PC 5300 DDR2 2 GB RAM at 667 Mhz. You said you have two slots for RAM. If you want to upgrade to 4 GB RAM then get the PC 6400. Both are compatible the only difference is the RAM speed which is 667Mhz on PC 5300 and 800Mhz on PC 6400. The 800Mhz stick will automatically be under-clocked at 667Mhz by the motherboard so both RAM sticks work at the same speed to avoid problems.
Just to make things clear
PC 2700 is 400Mhz, 3200 is 533Mhz, 5300 is 667Mhz and 6400 is 800Mhz.
Don't worry get the RAM.

edited by moderator: Deleted unrelated link

Report •

January 24, 2011 at 12:18:38
Why didn't you list the make/model of your board?

The 2 in the name of the RAM is the key. You have DDR2 memory which can either go by it's effective speed - DDR2-533, DDR2-667, DDR2-800, etc - or it can go by it's bandwidth - PC2-4200, PC2-5300, PC2-6400, etc. The other RAM you mentioned (PC2100, PC2700, PC3200, etc) is DDR-SDRAM (aka DDR1). It's totally different & will NOT fit in your motherboard.

Regardless, if you're running XP 32-bit, it's pointless to add more RAM. XP only supports a max of 4GB, but only 3.0-3.5GB is actually useable due to the way the other devices are mapped to the Virtual Address Space (VAS). You're better off sticking to 2GB until you upgrade to Win7 64-bit. Check this how-to written by jam:


BTW, for an AMD system such as you have, you should be running DDR2-800 (aka PC2-6400), not DDR2-667 (aka PC2-5300). And even if you disregard my suggestion to stick with 2GB, why the heck would you pay $120 for 4GB (2 x 2GB) locally when you can get it at newegg for $55?


Report •

Related Solutions

January 24, 2011 at 13:48:08
I didn't catch what aga wrote until now. It's a complete mess.

"PC 2700 is 400Mhz, 3200 is 533Mhz, 5300 is 667Mhz and 6400 is 800Mhz."

These numbers are correct:

PC2700 = DDR333 @ 166MHz frequency
PC3200 = DDR400 @ 200MHz frequency

PC2-5300 = DDR2-667 @ 333MHz frequency
PC2-6400 = DDR2-800 @ 400MHz frequency

Hey aga, you blog link doesn't work. Get rid of it.

Report •

January 25, 2011 at 09:21:43
Well everyone know that DDR is double data rate and a RAM at 800Mhz run at 400. What I was trying to say was that the 6400 and 5300 were actually the speed differences. BTW I fixed my Blog Link.

Please help by promoting my blog by visiting it. The Link is below.

Tek Ideas Unlimited

Report •

Ask Question