"That's really odd. My Samsung Original 512Mb stick purchased last week from
www.overclockers.co.uk can barely do DDR375. Any higher and it goes unstable. The stick is a 0224 DTL and I'm using it on an Abit BG7. Vdimm 2.8v never helps either."
Did you try burning in? Except sounds like OC.uk pretests so it is already done.
All the testing I've done with various DDR suggests things are a crapshoot. A lot depends on the motherboard. Supposedly the latest DTL sticks are supposed to do real well, but what does 'latest' mean? 0225, 0226, 0228?
I have four rigs and got bored so set up my CUV266 board and little 600E that does 156 FSB for 936 mhz. Previously I used my best CTL sticks dated 0208. This time I used the 512 MB 0221 DTL stick. Wouldn't do 156. Not 155 either. Had to drop down to 152. Heck, I can do 150 with 512 MB of SDRAM. The advantage of the CUV266 is it's a Coppermine board that uses DDR. On this board, I can only run 1:1.
What's happening here is my CPU is probably at it's limit and is affecting the ram, as all my sticks do at least 170, 2-2-2-5-1.
Had a hunch so changed to my XMS3200. Did 155 but not 156. Finally tried the junk 0225 CTL sticks and it also did 155 but not 156. With the DTL stick, sometimes the computer would spontaneously reboot. This rig seems real happy with the junk CTL sticks, so I decided not to sell them over the weekend and keep them for my Athlon rigs. I'm happy at 170, 2-2-2-5-1 on an Athlon board. If I need to do 190 or something I'll drop down to 2.5 or 2-3-3. Remember, these sticks are overachieving. In Sandra they are identified as CAS 2.5 at 167 mhz and CAS 2 at 133.
So I figured, maybe the 0221 DTL stick is expendable? Yet that was the only one to do DDR400 on a finicky MSI 645DX board! Even the cherry 0208s CTLs wouldn't do it. So go figure.
Unfortunately, for most people, it's not cost effective to own several different sets of DDR and to custom tailor to your rig. I'm in Japan so I can sell used XMS3200 for equal or more than I paid for it in the U.S. Right now I'm holding on to all the sticks until the dust settles.
BTW, my 0208 DTLs and XMS3200 may very well be capable of DDR453. I tested 170, 3:4 (DDR453) on my P4266-E board, since I finally got a 1.6a that will do it, and both posted cleanly but had a registry restart blue screen. However when I dropped down to 166 found out Win98SE had not corrupted and was OK. This is on the virge.
After I took the board out I realized I didn't have the VMEM overvolt jumper on so I was running at 2.5 volts! Maybe the ram will do it at higher voltage (duh, I would think dat would help
).