For some reason, Intel is letting reviewers test this chip, even though it's a month early. Following in the now more frequent Intel tradition of previewing designs early, it appears that they are continuing to show their good execution of having workable parts well ahead of launch.
However, I was a little disappointed in the rather mediocre performance turn-out. Actually, 1-6% is about what I expected from the 1333 MT/s FSB by itself, but the downside is really the P35 chipset. True, not a single one of these reviewers bothered to test with DDR3 memory (or anything other than DDR2-800 memory, even though the chipset supports DDR2-1066 and DDR3-1333, either of which would have boosted performance).
Moreover, the chipset is quite a bit higher power, moving Intel in the definite wrong direction when it comes to matching AMD in idle power.
PCPER seems to be the only website that tested both the E6700 and E6750 on identical chipsets, and hence it seems the only reliable comparison for processor cores. According to their review, the new G0 stepping does indeed consume less power (about 6W less in idle and about 12W less under load). Unfortunately, this is completely lost when paired with the much higher power, but equally performing P35 chipset, which is unfortunate.
On the bright side, overclocking headroom indicates that the G0 stepping can go far beyond the current Conroe chips. These reviewers seem to have no problem getting in the 3.6-3.8GHz range, making me wonder why Intel didn't lend out E6850 chips running at 3.0GHz, which would have left a better performance impression. Perhaps Intel is saving these for launch. Based on the overclocking headroom, I would suspect the higher speeds are binning quite well.
So, overall, the prognosis seems to be as follows:
E6750 Performance - Minor (1-6% better than E6700), and in rare cases worse (probably due to gearing between 800MT/s memory and 1333MT/s bus... DDR3-1333 memory should allow much better performance)
E6750 Power - Decent reduction compared to the E6700, but unfortunately not realized due to poor chipset implementation
E6750 Headroom - Clearly better than E6700
E6750 Price - TBD as far as these reviews go, but I think we've seen the correct rumors. The E6750 will be aimed at $183, compared to $316 for the current E6700.
E6750 Overall - A step forward, especially in price/performance, which will put a lot more pressure on AMD next month. It's a shame that it couldn't be better all the way around, but I'll take what appears to be slightly better performance and much better binsplits for Intel. It will allow them to drive down costs and lower prices, to allow for more share gains vs AMD. I think AMD will continue to have a low power story for this year, but we'll see if consumers buy the brown bananas, just because they are 10-20W lower in system power.
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