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Doesn't triple-channel give higher performance?
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That is a tough one. Memory drives the performance of your system but does not perform by itself. So there is a performance advantage within some applications, but with most, triple channel memory does not drive higher performance because this could be the way these applications are structured to not lend themselves triple channel configurations, similar to how single threaded applications don't show a boost with a quad core. The advantages are minimal.
The actual performance of your system depends on your CPU and that is where Sandy bridge CPUs beat (smoke) similarly priced LGA1366 CPUs, regardless of how many channel memories are used. Higher instructions-per-cycle allows them to perform more work at any given frequency
, a more mature 32 nm manufacturing process allow these to clock to higher frequencies, while consuming less power and producing less heat. A double channel memory driven i7 2600 will outperform a triple channel memory driven i7 950 while using less power.
As for motherboards, that's a tough one too. If you are planning to go Tri SLI, then you won't have restrictions on LGA 1366. As for Sandy Bridge, you are restricted to the higher end boards that carry the nf200 chip, which enables 3 cards @ x8 lanes ot two cards @ x16 lanes each, such as Asus P67 revolution for $270 or other ones that should appear in shops before the month end.
and with graphics cards in Tri SLI, you are restricted to GTX 570 and above because GTX 560 and below support a maximum of 2 cards in SLI. As with the memory issue discussed above, difference between LGA 1366 native 2x 16 lane support and 2 x8 is minimal compared to the huge advantage of sandy bridge cpus.
Now before we get to the meat of this system you want, what resolution will your display be? If you're really going to go TRI SLI, then you have enough power to drive pixels on three screen surround, and that would be overkill if you are using only one display.
for $1500 my build would look like this:
Asus P8P67 Pro $200 (for triple SLI you need something better, there will other boards available soon)
i7 2600 $330 (add $20 to get the unlocked version for overclocking)
G.Skill 4x2 8GB 9C $100
WD caviar Black 1TB $100
Adata Sandforce SSD or OCZ Vertex2 $150
Corsair TX850 V2 $115
XFX HD 6950 2GB $310 or any card of your choice
Asus DVDRW $25
Inwin Dragon Rider $150 or Corsair Graphite T600 $170 (case is all up to your preference)
Prices may be lower if you price match, but total is under $1500