DDR2-1200 5-5-5-x would have a bit higher b/w than DDR2-1000 4-4-4-x and latency should be around the same depending on ur fsb config. But DDR2-1000 4-4-4-x is a really good 24/7 DDR2 ram config anyways. DDR2-1200 is usually harder to reach and it's more stressful for the mobo too. I wasn't able to run DDR2-1200 on my config with 8x500 using divider 1.2x and voltage 2.3v or less with either the Cellshock PC2-8000 5-5-5-15 (D9GKX?) sticks or my Team Xtreem DDR2-667 3-4-4-8 (D9GMH) but my Team clocks better and was able to do it in single channel at least so it might just be my mobo that have probs with dual channel in DDR2-1200 (tried upping NB volts quite a lot too) and the Cellshocks didn't seem to like this board or maybe the bios version possibly (will switch back to the older and faster bios when I get the new CellShock sticks from RMA).
Running 500x8 1:1 DDR2-1000 4-4-4-8 25-11-11-5-5 Performance Lvl 7 w/ BIOS v14 on my IP35 Pro I get ~9950MB/s read and ~49ns latency in Everest benchmark which I'm quite satisfied with. At 1.2x divider with 500 fsb DDR2-1200 5-5-5-15 I'd expect it to be around 10050 ~ 10100 MB/s read and 47~49ns or so.
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