Corsair XMS Cas2 not running at Cas2?!

squiffy

squiffy

squiffy

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I've left the timings in the BIOS to auto. With CPU-Z it reports CAS3. When I change to CAS to the machine won't boot. I can select CAS2 (Tcl) and that's ok. Motherboard is A8R32-MVP Deluxe. Do I need to do anything else on the memory settings to get CAS 2 to work? What settings for each should I use? (page 23 of the motherboard manual)

CL, TRAS, TRP, TRCD, TRRD, TRC, TRFC, TRWT...

ok here's a pic with CAS and TRAS manually changed (ok?)
pic.jpg
 
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Are you absolutely sure that it really is cas2 ram? because the SPD would have said cas 2, and in your screenshot it says 3. Ypu might have received some wrong sticks.
Could be wrong though
 
/\/\/\/\/\/\ what he said. Really looks like incorrect memory. Check the revision number with whats stated on the corsair site and see if that throws up any info.
 
i have the same memory and it is indeed cas 2................u have set to the required volts in bios? (2.75)............and id say u wont be able to run cas 2 at 220, my mem maxed at fsb210 2,3,3,6 2t, so now i run at 180 2,3,2,5 1t.....but cpu is clocked nicely...
 
Try running at vdimm of 2.8v and see if that enables cas 2. Some memory needs more than the usual 2.6v to get the lower timings. If its the same as me old memory, XMS3200C2PT, then that SHOULD run at 2-3-2-5-1t @ 200mhz, if it doesn't at 2.8v, then its either faulty or the wrong memory and it needs to be rma'd I'd have thought. Wait and see if anyone else replies here, they might know a bit more than me (not difficult :D )
 
I have 1 x 1gb Corsair XMS3200C2pt. I run that at cas 2 with the best poss timings 3-3-6 - 1t and its fine. I've set to 2.75v from bios as recommended by corsair themselves.
 
I have exactly the same memory as you and mine is reported at 3,3,3,8



At 220mhz you have no chance of running cas2. I have tested mine up to 205 @ 2,3,2,5, 1t @ 2.6v and its memtest error free. Doubt it will go much further than 205 but havent tried. As for all its cas2 for intel and cas2.5 for amd - thats a loada s***. These sticks are 2,3,3,6 1t @ 200 @ 2.75v for amd and intel
 
ok got it working at 2-3-3-6, I dropped CPU OC back to standard, manually set voltage to 2.75 and TRAS to 6.

So I have a choice of stock CPU and faster memory, or faster CPU by 200mhz or slower memory. Which is best?
 
squiffy said:
ok got it working at 2-3-3-6, I dropped CPU OC back to standard, manually set voltage to 2.75 and TRAS to 6.

So I have a choice of stock CPU and faster memory, or faster CPU by 200mhz or slower memory. Which is best?
Click to expand...

Run it on a divider so you have you cpu o/c and your memory at 200 with tight timings. You should be able to get that memory stable at 2,3,2,5, 208ish, stock volts. Id then run a benchmark and then put memory on 1:1 divider and at 2.5,3,3,6 and then bench again. Would have thought that it will be quicker on a divider but you wont know until you try
 
That RAM has more reported in CPU-Z on my version, the timings he got were correct for default timings, but they will go down further. Friend of mine had them runnign at 2-2-2-5 on stock, so they should go down further :)
 
i have *** same ram and mine is also reporting at cas 3. its been working great tho.
its frequency is 201 so i duuno why its cas 3
 
Mine displays the same as everyone else's. Goes a lot better than that though,

mines @ 225 with CAS 2.5 .3.3.6 1t.

Was on CAS 2 when mem was running 208 but wont boot now I've clocked it so high.
 
just tried cas 2 booted but crashjed on starting up of cpuz, changed to cas 2.5 works fine now. what exactly do better timing improve?
 
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