Originally Posted by melgross
It depends on how important the few percent is to you.
As far as the difference between the 2.8 and the 3.0 goes, apparently the majority of tests show the 3 to be faster. It's very possible that a few operation's speed is reversed in the different chips.
Something about bin speeds. Remember that these are supposed to be IDENTICAL chips. What that means, is that in theory, they should all be the SAME speed. There should be NO bin speed differences.
In practice, manufacturing isn't perfect. Ever so slight differences in line widths, depths, and spacing, add up to minute differences in capacitance. The higher the capacitance, the slower the speed.
BUT, these chips are hellishly complex. That means that on the same chip, there will be these variations. Where they are on the chip will decide how slow the chip is, and what part of the chip is affected the most.
So, one chip can have a silghtly higher bin speed overall, but still be slightly slower in some operations.
Each chip will be affected differently. Two chips with the same bin speed can have slight variations in operational "evenness". Some may have some operations a fair amount faster, and some a fair amount slower, and others may hover closely around the speed number given.
So, these tests we've read are valid for those machines. but, as we are talking about minute differences, too small to notice in most cases, they are not valid for a different set of machines because of the varibility in manufacturing.
This also holds true for the motherboard, as well as for the rest of the machine.
On average, each machine will be approximately spaced as they should be. It's possible that the 3.2 machine here was fast, but the 3.0 machine was slow, and that the 2.8 was also fast.
This is always going to happen when the speed differences between machines are so small. If we had a 2.6 a 2.9, and a 3.2, we wouldn't see this happening as much.