I have a P4T-E board with ICS-13 DRCGs. I currently have a 1.6a up to 2.3 gig at 144 FSB/4X. The system is not 100% stable, as I get minor memory problems, but 3D runs fine, and the last couple of runs of 3DMark2001/2000 have all cleared. Last night I just installed a Leadtek 250 Ultra TD and got it stable at 338/747, with two 80 mm fans hotglued to the heatsink. I also completed the CodeMaster demo, X-Island demo, the Wolfman demo, and the Serious Sam 2nd Encounter demos no problem so I would say the whole system is stable enough in 3d for me
. I broke 12k with the latest Detonator 28.90s, which is pretty good for just a 2.3 gigger.
I've done extensive testing and RDRAM can hit bandwidths without sweating that DDR guys can only drool over.
Yes, PC1066 should hit around 3300/3300, but only 20-25% of the guys can run truly stable there (133/4X RDRAM), since getting good RDRAM is a crapshoot. At my 144 FSB/4X, I am at PC1152 and I get 3583/3581!
At 138/4X (PC1104), I still got 3450/3450. Even at 144/3X (PC864), I got 3000/3000.
There are some guys on Anandtech who are breaking 3000/3000 with DDR but they are using the Samsung PC2700 DDR333 and they have to run a 3:4 ratio on their FSB to hit 200+ mhz on the ram. That's really pushing it, though it's only 150 FSB for the CPU. Most guys hitting 180-200 FSB on the DDR are getting 2800/2700 or a bit less.
Just plain PC800 should be good for around 2500/2500. So when official PC1066 comes out, DDR guys will have a hard time matching 3300/3300. But I hear the PC1066 will be 32-bit and not sure it will be compatible with PC800 motherboards.
BTW, I got nothing against DDR. In fact, I just broke down and bought 512 MB of the same Samsung DDR, since I gave up trying to run SDRAM on my XP1600 rig. Since I already have the DDR and a Northwood, I said what the heck and picked up a used P4B266-E board last weekend. Now I'm ready to go DDR with the Northwood (but the board doesn't do 3:4 above 133 FSB). It will be a step backward from the P4T-E performance-wise even if it did, but it may be more stable on the memory end. But frankly, I wonder how stable that DDR is at 200 FSB? After all, anyone can post and boot into an OS long enough to pull off a couple of Sandra benches, but can they clear 3DMark2001? I found I can pass Prime95 no problem yet lockup in that.