4 DIMMS vs 2

Dennis wrote:
For Windows 7 I "upgraded" from 2x512mb corsair gaming memory DDR400
with with fast latency settings. I added 2x1gb kingston crappy-value-
memory DDR400. Total is 3gb now.

System wont boot with the memory clocked to 400mzh, if I set it to
AUTO it chooses to run at 316 mzh (158x2). I expected some performance
loss but this is more then i "bargained" for. It is noticable. I'm
thinking about taking the crappy kingston memory back.

Question(s): is it even possible to hit 400mzh on 4 dimms (2x512mb and
2x1gb)? How much loss is to be expected? Also, if I bought DDR 500
would it have better luck running 4dimms at 400mzh?


thx



Try the 2x1GB Kingston by themselves. That might be a compromise solution.

Some BIOS have the manual settings, to experiment with bumping the speed
setting (DDR400) or Command Rate (1T or 2T). The memory should be
thoroughly tested with memtest86+ (memtest.org) and Prime95 (mersenne.org/freesoft).
Prime95 runs in Linux as well as Windows, and I can use a Linux LiveCD
to boot up Linux and run Prime95. That avoids the usage of the
Windows hard drive, until I know the memory is stable and
error free.

It really would have helped if you mentioned the motherboard make
and model number. I'm guessing this is a S939 board, but you'll
be able to verify that by giving make and model number info.

Paul

On Nov 27, 4:19*pm, Paul wrote:
It really would have helped if you mentioned the motherboard make
and model number. I'm guessing this is a S939 board, but you'll
be able to verify that by giving make and model number info.

Yes it's a 939, an Asus A8N-SLI Premium. I guess I will start messing
around with the timing settings and some overclocking. It normally
runs on 400mzh DDR1 - anyone have thoughts about what happens if I
load it with DDR 500mzh (PC4000)? I wont be able to do this
financially, but for next time I'm just curious if this would help to
keep 4 sticks running at 400mzh instead of it dropping down to 366 or
lower like it is now.