OCZ DDR400 Platinum EL 1GB sticks not running at 2-3-2-5 @ 1T?

F

fromage

[H]ard|Gawd
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For some odd reason, the OCZ DDR400 Platinum EL 2x1GB dual channel kit I purchased on boxing day, does NOT run at 2-3-2-5 like advertised. SPD reports as 2.5-3-2-5. I cannot run 2-3-2-5 at 1T, however 2T works fine. But the funny thing is, SPD is CAS 2.5, shouldn't it be 2?

The memory is this:
http://www.ncix.com/products/index.php?sku=14504&vpn=OCZ4002048ELDCPE-K&manufacture=OCZ Technology

I am running this with:

AMD Athlon X2 3800+ Manchester
Asus A8N-SLi Deluxe w/ 1015 BIOS
OCZ DDR400 PC3200 Platinum EL 2x1GB Dual Channel currently running at 2.5-3-2-5 at 1T
eVGA 7800GT CO
Maxtor DiamondMax Plus 10 250GB 7200RPM 16MB Cache
Antec TruePower2.0 TPII-550W SLi Certified

Why can't I run 2-3-2-5 at 1T? If I try it, my computer won't run Super PI, fails Prime95 after a few seconds, etc.
 
spd can be wrong. manually set it to 2-3-2 to see what happens

the 2T issue is something that's known to happen with asus boards.
 
Mine did that too. Once you set it in the BIOS to 1T 2 3 2 5 and also make sure it's set to DDR400 you should be good to go. Mine works great.
 
You know, the NF4 AMD motherboards from Asus are quirky, as far as using PC3200 memory modules with SPD's programmed for CAS 2 latencies and using 1GB sticks of PC3200 memory are concerned. On those mobos, the 1T command rate setting works properly only with single-sided 256MB or double-sided 512MB sticks of memory (256Mbit IC memory density), and CAS 2 programmed sticks default to CAS 2.5 (2-2-2 sticks get detected as 2.5-3-3, while 2-3-2 sticks get detected as 2.5-3-2). Single-sided 512MB sticks (512Mbit IC density) will have the same problem with 1T as the 1GB sticks will on these Asus mobos.

What all this means is that these Asus mobos will only run up to 1GB total at DDR400 with 1T command rate; if you put 2GB of RAM, you'll have to use one of the following - a 2T command rate, DDR333 speed or loosened timings - just for such platforms to run stably.
 
Man, I thought that only applied to 4x512MB. Damnit, this really bites ass.

I was told that 4x512MB is bad, but now I realize 2x1GB is just as bad? Bah humbug

In that case, what's better, 2-3-2-5 @ 2T or 2.5-3-2-5 @ 1T?
 
you think lowering cas from 2.5 to 2 might outweigh raising command rate from 1T to 2T? ;)

also, 2x1gb normally isn't bad. just that some boards have weird issues. asus and epox are the two on my list so far :p
 
(cf)Eclipse said:
you think lowering cas from 2.5 to 2 might outweigh raising command rate from 1T to 2T? ;)
Click to expand...

Actually, using 2.5-3-2-5 1T would be better than using 2-3-2-5 2T, in this case.
 
OCZ programs at CL2.5 to allow the modules to boot on systems with low startup VDIMM voltage, such as those Gigabytes that default to 2.5V. Put 2.8V through your memory and try running 1T again, though your Asus board may not be capable of 1T.
 
It's already running at 2.8v. So my A8N-SLi cannot run 1T, wow. Retarded.
 
Updated the BIOS to 1016, 1T now passes Super_PI. Doing Prime95 right now. 42 seconds for 1Million
 
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