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Motherboard asus?

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Motherboard asus?

Want some new ram ok 512 ddr 400mhz. My board is an a7n8x-x and it says it can surport 400mhz ram ddr. Look on a few site and people have the same board and bought 400mhz ram but the ram is only running at 200mhz. Any 1 find out for me what ram is compatiable with this board so it can run at 400mhz. Thanks all
6 REPLIES
Community Veteran
Posts: 14,469
Registered: 30-07-2007

Motherboard asus?

PC3200 DDR 400 Mhz ram does run at 200Mhz which is the FSB speed - DDR stands for Double Data Rate which means if the FSB is 200MHz the ram will run at double this speed which is 400MHz.

Just look for PC3200 DDR memory and it will be what you are after.

Note: you have to change the FSB in the BIOS to 200MHz to run the PC3200 memory at it's full speed of 400MHz. If the FSB is only set to 100Mhz, the ram will only run at 200MHz (double the FSB rate).

PC2100 (DDR 266) requires an FSB to be 133MHz
PC2700 (DDR 333) requires an FSB to be 166Mhz
PC3200 (DDR 400) requires an FSB to be 200Mhz
N/A

Motherboard asus?

i would recommend getting 2 sticks of 512 maybe a matched pair *sold in a single box* so that ur DDR can run in dual channal mode to get the best performance out of it. *also xp kinda likes 1gig over 512.. it runs a lot sweeter*

buz
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Motherboard asus?

Yeah thats what i want 1gig from here or my local shop.

http://www.ebuyer.com/customer/products/index.html?rb=1382153347&action=c2hvd19wcm9kdWN0X3Jldmlld3M=....

But i looked on the reviews about this ram and 1 guy has used it on my board and it says it runs at 200mhz so which is max speed then.
Sorry not full equiped with all the meaning yet.

Thanks all
Community Veteran
Posts: 14,469
Registered: 30-07-2007

Motherboard asus?

He probably forgot to change the FSB speed to 200 (It will be running at 100).

I explained this in my previous post.

P.S. your link just gives me a blank product page. What is the ram you are hoping to buy, and what does it cost?

There are plenty of other places where ram can get purchased, possibly cheaper.
Community Veteran
Posts: 14,469
Registered: 30-07-2007

Motherboard asus?

OK, I found what you were looking at: Crucial 512 DDR400 PC3200 CL=3 Memory Module

However, you have misunderstood the comment you refered to in your fitst post. It said:
Quote
stuck this in a a7n8x-x

worked perfect at 200mhz


This means it works fine at 200MHz FSB which is the speed of the FSB you need for the memory to perform at 400MHz (DDR = double data rate, double the FSB speed).
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Motherboard asus?

http://uk.asus.com/prog/spec.asp?m=A7N8X-X&langs=11

This link is my motherboard specs and the bottom it tells you what my board can accept with ram. I read futher and i found out that some other guy with my board had got 2 512ddr sticks and one works ok and the other is faulty. It says on the site samsung ram works good but cant find that any were.