Corsair TwinX2048-3200C2PT Questions..

Just wondering, I cant find ANY information on these...
Are these modules using TCCD or BH-5 chips? The stock voltage recommended by Corsair is 2.75V.
If any of you have this memory, how high have you pushed it before?? I've never crossed 2.90V with it yet... dont want to push it too far, how far would (theoretically) be too far?
My results with this memory is weird, the highest OC I can get with it using stock timings (2.5-3-3-6-1T @ 2.85V) is 228mhz (456mhz). When I raise it to 2.9V, I still cant go any higher, so wouldnt this point to TCCD? Doesnt BH-5 love high voltages and keep going higher? Or have I got it backwards?
Heres where I purchased it from -
http://www.zipzoomfly.com/jsp/ProductDetail.jsp?ProductCode=80097-55
Seem to be o.k. memory, although when I put it in the orange slots on my Ultra-D, windoze only detects 1GB.
Also, this RAM seems to be extremely picky about what dividers I use, it this the memory being picky, or the memory controller on my Sandy?
I'm trying to break 7GB/s memory bandwidth, and right now I'm stuck on 6.8... I'll be happy if I can get to 235mhz and keep CAS 2.5... Is it dangerous to go on up to 3.0-3.1V?
Thanx in advance for any information!

-D

I'm not sure what chips they have but they do act strange. Voltage does not seem to do anything, and increasing the voltage over 2.9V resulted in more instability. I hit a stability wall at 250MHz with no timing changes improving overclock.
I don't know why you want to keep tCAS 2.5. Increase it to 3 since it doesn't really affect performance and try 3-3-2-x.

2.5 is the best I can get it to do in my system, even at 400mhz. I read somewhere that almost all of these modules can only run at CAS 2.5 in AMD systems and 2.0 in Intel... you must have gotten extremely lucky that u can run 2.0 in your Opty! If I try to run 2-3-3-6-1T@400mhz, I just get a series of beeps when I try to boot, and I have to reset my CMOS just to get any video on the screen.
Man, I'd be crazy happy if I could get these things to hit 250mhz! I'll try seeing if I can hit 250mhz with CAS 3/2.9V tonight.
Guess I'll have to have to pull the heatspreaders off to really see what IC's these are using.
Thanx for the reply

I'd like to know exactly what chips they're using as well. Good luck with tCAS 3, and also try lowering the voltage. I have my best overclock at 2.7V.

I managed to get 233mhz out of them at 2.85V at CAS 3... but bandwidth is still higher at 228/CAS 2.5...
Wonder why these chips dont respond very well to voltage adjustments? I tried running 3.0V, but still couldn't exceed 233mhz.
Wish there was more information out there, I'm dreading attempting to pull these heatspreaders off.. I have some Arctic Silver thermal adhesive, is that all I should need to put the heatspreaders back on?

EDIT: Also, what kind of memory bandwidth are you getting at 250mhz/2T? I havent tried using 2T yet, still OC'ing with 1T...

DareDevil, i got the same speed out of this ram as well. 233 3.4.410 timing @ 2.8V i was hoping it could go a bit more so that i can get my opteron 165 to 2.9

I must have gotten a pair binned for higher speeds, or a decent memory controller to make up for sub par clocks. 2.5-3-2-x is good up to ~235 MHz 1T, 3-3-2-x is good up to 250MHz 1T, 3-3-x-x at ~250 MHz 2T, and 260 MHz 3-4-2-x is SuperPi stable. I have to use 2T because of a flaw in this board that causes flash site crashes, but the performance is only .5% or less below 1T because of tighter timings. My SS measured bandwidth is 5600 MB/s with my recent timings 250Mhz: http://img326.imageshack.us/img326/9643/timing3ws5wq.jpg

r3w4 said:

.....My SS measured bandwidth is 5600 MB/s with my recent timings 250Mhz: http://img326.imageshack.us/img326/9643/timing3ws5wq.jpg

Click to expand...

How come my bandwidth is a lot higher? I'm getting around that score with stock settings (SiSoft Sandra 2007) and when I get my memory maxxed at 233mhz, I get around 6680?? The OC in my sig at 3GHz, running a 150 divider leave my memory running at 215mhz, and benches around 6200.. seems weird...
Going to try and pull the heatspreaders tonight after I get done doing some 2T testing.

It's because your cpu is at 3GHz. My score seems normal though since it's about the same as the Intel 875P DDR-500 CL3 (1T CMD), which is 5600.

hmmm... Your bandwidth of only 5600 mb/s concerns me... my CPU and memory at stock settings, 2.2GHz benches 5844/5838 in Sandra 07 Pro, since we have the same memory, thought I'd post you my settings and see if you can get some more bandwidth... 2T must be killing it for you, you should be bumping or breaking 7K at DDR-500 speed!

CMD: 1T
CAS: 2.5
tRCD: 3
tRAS: 7
tRP: 2
tRC: 9
tRFC: 11
tRRD: 2
tWR: 2
tWTR: 2
tRTW: 2
Refresh Period: 3120
Write CAS latency: 1
DRAM Bank Interleave: Enabled
DQS Skew Control: Increase Skew
DQS Skew Value: 255
DRAM Drive Strength: 6
DRAM Data Drive Strength: Level 3
Max ASYNC latency: 6ns
DRAM Access Mode: Fastest
Read Preamble Time: 4
Idle Cycle Limit: 32
Dynamic Counter: Disabled (Note this option is always different for different RAM)
R/W Queue Bypass: 16x (I noticed one of your screenies shown you were running 8x... why? 16x is much faster!)
Bypass Max: 7x
32 Byte Granulation: Disable

I can even overclock to 230mhz and not even have to change a thing, and benchmark around 6.8 GB/s (running [email protected], 150 divider - DDR-233/466, at 2.8V, my everyday clock, 10x300@3ghz in my sig is max OC, only use it for benching purposes). This memory is behaving like BH-5, since it seems to benefit from stronger DRAM drive strengths.

I also have this mem sticks. Best I could get was 227MHz at 2.5-3-3-6. Loosening them to 3-4-4-10 didn't help, neither was increasing voltage.

Currently running it my rig at 2-3-2-6 DDR400 (by using dividers).

Wat rev do u have? The best I've seen would be v1.6 as they use Infineon chips. Most of the other revs all use Nanya chips, which such at OCing.

1GB-per-stick do not have TCCD or BH5 variants. Those specific memory chips are only for the 512MB-per-stick ones.

I dunno what revision I have, will look tonight and post again, should be on the sticker on the RAM right?
I know we definately have different RAM, because mine won't even boot at CAS 2, even though they're rated at CAS 2, most of these chips will only run CAS 2 in Intel systems (2-3-6-3) and CAS 2.5 in AMD (2.5-3-7-2). I was going to try underclocking it tonight, to maybe 380mhz or something, and see if it can handle CAS 2 then...
This thread has gotten me into tweaking this stuff pretty bad... right now though I'm stuck messing around with DRAM drive strength and DRAM data drive strength... getting mixed results with different settings, and they arent making a lot of sense...
Also been doing some more overclocking and testing, and I don't know if it's my memory, or memory controller, but I cannot run ANY speed on a 10.5x CPU multiplier. Must be a whole number, 9x-10x-11x, etc. Weird... If I chose 10.5x, even clocked at a low speed, say 2.45GHz for example, I get weird red and green blocks on the black start up screens, and gets hit with a B.S.O.D. when the welcome screen appears. I also cannot put these chips in the orange slots on my Ultra-D... which is odd because everyone else with this board has much better performance and OC stability in the orange slots, even people who have this exact RAM...
I think I just run into some bad luck and got some crappy binned stuff. Oh well, just another reason for me to get some DDR-600

My sticks just showed up today.
My initial run was 2-2-2-11 @ 200 and 2.6V. From there I could bump the FSB up to 211, after that things get flakey at 213 and no post at 214.
I reset to 2-3-3-11 and upped the volts but it didnt get any better.
Back after more tests.

Wow. At 3-4-4-11 @2.9V they went throught the first 4 runs of Memtest just fine at 245.

Edit:
Now running well: 3-4-4-11 @ 2.8V & 240FSB

2.6V? Corsair rates this memory at 2.75V
Try increasing skew in the BIOS, and if you set a skew value, max it on 255. This got me about an extra 500mb/s.
Also, using Level 3 DRAM drive strength doesn't help performance, it makes the signals to the memory a lot stronger, and most of the time will help you overclock some more. Since I enabled L3, I also have been able to reach 240mhz! 3-3-7-2-11-1T. Getting just a hair under 7000 mb/s bandwidth

Finally!! I've managed to hit my goal, 250mhz!! On 1T CMD Rate!!
I found a sweet spot using these timings:
3 - 4 - 11 - 4 - 14 - 3 - 2 - 1T, DRAM drive strength - 7, DRAM data drive strength - level 3. Running at 2.95V.
When I set these timings, I went ahead and booted my max OC like normal, 3.0Ghz, 150 divider = DDR - 215mhz... Then I thought I'd give the 166 divider a chance, and it bumped em' up to 250mhz, and everything seems stable, been benching in Sandra, and going to let memtest run tonight for a few hours... Now I'm happy

Ok, I have some good news, and some bad news (at least for me).
The good news is I found a list, right here under my nose (RedDragonXXX's sticky) and it shows all of these chips:
http://www.ocforums.com/showthread.php?t=415294

I'm assuming CMX means individual modules, and TWINX means pair.

CMX1024-3200C2 XMS3202v1.2 0523005-2 = Infineon -5 Rev B

CMX1024-3200C2PT XMS3202v1.2 0521090-2 = INFINEON, Die Rev A 64M X 8

CMX1024-3200C2PT XMS3202 V1.2 0524133-4 = INFINEON, Die Rev A 64M X 8

CMX1024-3200C2 XMS3202V1.2 0528082-2 = INFINEON, Die Rev A 64M X 8

CMX1024-3200C2 XMS3202v1.1 0511077-0 = INFINEON, Die Rev B

CMX1024-3200C2 CMS3202v1.3 = Need more Info, But 90% it’s Infineon Rev B

CMX1024-3200C2 XMS3200v2.1 0533084-0 = Nanya -5 Rev B

CMX1024-3200PT XMS3200v4.1 #0522215-2 = INFINEON, Die Rev B

CMX1024-3200PT XMS3200 v4.1 0523076-4 = INFINEON, Die Rev B

Twinx2048-3200c2 xms3202v1.2, Lot#0528016-1 = INFINEON, Die Rev B

TWINX2048-3200C2 XMS3200C2v1.4 0531022-1 = INFINEON, Die Rev B

TWINX2048-3200C2 V2.1 XMS3202 0533085-1 = Nanya -5 Rev B

And at the bottom of the page is has:
Corsair ValueSelect VS1GB400C3 - Infineon BE-5
Corsair CMX1024-3200C2 v1.2 - Infineon BE-5

Heres the bad news:
1# Last night when I got these things to 250mhz, windows worked fine, and Sandra benches fine, but memtest fails almost immediately, and after I cold start the system, it can't boot Had to drop it back down to 234 to run memtest (only ran it for an hour though...
2# Those of us who have the v1.2 chips might have well bought some ValueSelect!!
3# My lot number isn't listed! My chips have-
XMS3202v1.2 0608110-2 CL2

Also, at the top of the corsair list, it shows what some of the letters mean, it states: "C2 = Cass 2-3-3-6 & Cass 2.5-3-3-6 On AMD Platform."
Why am I seeing so many people around here running CAS 2 with AMD systems? I can't even boot with it!

Ok, here's something else - on the above list, there's 2 v1.2's up there, one has INFINEON, Die Rev A 64M X 8, the other has INFINEON, Die Rev B. What's the difference in the 2, and why is my chips not listed? Perhaps they weren't manufactured before this guide was made?
Anyways, seems like its safe to say that I have some sort of Infineon chips, but I am a noob to memory, and I always thought there was UTT, BH-5, and TCCD... what's BE-5? Anyone have any useful information I need to know about it? Is it any good?

I always thought that there were 2 basic stereotypes about BH5 and TCCD -
BH-5 Owners should use really high voltages, low mhz and tight timings
TCCD Owners should use high mhz and loose timings
BE-5????

Thanx for any help in advance!

X2 4600 E4 w/ Thermalright Si-120 + Silenx 38x120
2.8ghz @ 1.4v 11x255
255x4 htt
166/200x255 divider = 200.4Mhz = CPU/14 for Corsair PC3200 XMS TwinX 2048c2 @ 2.5-3-3-7-13-1T-16
Antec TP 530W 30A 12v, 40A 5v PSU
35'C cpu temp = 28 and 31 idle --- 44-47' 100% load
Stable for Photoshop CS3, DVD encoding, Premier pro 2, DVD to ipod, internet...etc....10 other programs///

Super Pi stable.... prime95 stalls after a few minutes !!!???? Don't know why = doesn't make it mean that my OC Athlon sys is unstable = synthetic !

Corsair XMS Twinx 2038C2 disappointment...relief.

I also have a 2gb Corsair XMS Twinx kit I bought for $400 in April 2005, for my Athlon 64; then my X2 4600 E4. Couldn't OC over 221Mhz.

Also discovered my error using my amazing A8N32 sli deluxe mainboard, when I thought I had a good OC at 221x12=2.65, mem div 216....which actually had the XMS running at 110Mhz. SPD states 3-3-3-8-1T @ 400Mhz ????? These are supposed to be cas 2: correctly, cas 2.5 for Athlon 64's...

ANYWAY, to cut to the chase, after voltage, timing, div... I finally found the last pair of PATRIOT PC3500LL 2gb kit at Fry's for $99 !

Guess what ? These sticks are amazing:

I ran my system first at 300x9 with a 166 div.... for some reason 183 div would not really boot ? But it wasn't really super stable with prime95: i core always failed after a minute etcc....I could even run windows quite nicely at 315x9. But I use Photoshop CS3 and premier pro 2 a lot and need fast cpu speed....I now realize fast ram too.

Today, I quickly reset in bios NO divider = 200 limit = 1:1 right.

raised the cpu multi to 11x and reduced the LDT/HTT to 233 and left ram at 2-3-2-5-1T... worked just fine...after I had to HARD boot my PC !

now it comfortably runs at 2.8ghz = 255x11, 1.275+0.2v vcore; all overvolting on, DDR510 @ 3-3-2-5-1T-2.7v ! Very happy. Runs Prime95 consistently with no errors too. Loads Win XP Home SP2 flawlessly and faster/snappier too !

Trying to strike the fastest balance now as close to DDR540 as possible, on AIR. Perhaps DDR500 @ cas 2.5-3-3-2-1T is faster, overall ? Auto SPD = 2-3-2-5-1T @ DDR433.

I am rather disappointed with my CORSAIR XMS TWinx, which I think may really be DDR400 only, at cas 2.5.