RAM problem on ABIT AV8

[GigaHz]

Hi ,

Can someone tell me if theres anything i can do about this .

I currently have 4 RAM modules for my main system :-

2 x 256mb GeIL PC4000
2 x 256mb GeIL PC3200

The Abit AV8 motherboard has 4 Dimm slots , When I use the 4 dimm slots I cant run the RAM at 1T only 2T , but when i use only 2 Dimm slots [ dual channel ] I CAN run the RAM at 1T .

Now with all 4 RAM modules total 1 Gb RAM @ 2T i get a SiSoft Score of 5321 MB/s

And with 2 RAM modules total 512 Mb @ 1T i get a SiSoft score of 6288 MB/s

I cant run 3 at all ? the board wont boot with 3 dimms taken up no matter what settings , even from a CMOS clearing the board dosent boot with 3 RAM modules inserted .

I had the 2 PC3200 and i just bought the 2 PC4000 modules for this system .

Is this normal for all boards ? or is it just my board , or my settings ?

[Bio-Hazard]

I'm not sure 100% sure, but I think you're gooing to have the same problem with all S939 systems. Those onboard memory controlers are really picky. But I think you'll need to do more reading, I don't think any system can run 1T with more that the frist 2 slots full. I might try it later though, I have a exter 2x512 PC3200 sitting on my desk right now................. :twisted:

[undergroundtech]

Some boards will perform better with the PC3200, than with PC4000 & visa versa.

When you run it with only two DIM's, which set of memory where you using?

Try using only the other pair of memory & run the benchmarks again to see which yields better performance. Could be the lesser performing memory is hurting your benchmarks.

[GigaHz]

I can get the board to run at 1T with either the 2 x 256mb GeIL PC4000 or the 2 x 256mb GeIL PC3200 .

The PC4000 gives better benchmarks , but if i run with only 2 x 256mb i have lost a whole half of my total RAM , due to a reasonable but not massive performance gain .

So i dont know whats better to run :-

512 @ about 5000 to 5500 MB/s
or
1024 @ about 6000 to 6500 MB/s

[undergroundtech]

You could always sell your PC3200 on ebay, and buy more of the PC4000.