Help with upgrade decision - 1366 or 1155 for crossfire+eyefinity

Soldato
Joined
27 Dec 2009
Posts
2,727
Location
Gillingham, Kent
Last week I was weak and ordered a second 5870 (honestly, the deal I saw was too good to pass up!). However, when installed on my system it produces stutter in most of the games I tried and occasional drop in FPS for a second. Overall, peak FPS was higher than with one card, but it was a lot more stuttery, minimum FPS were lower and it didn't feel as smooth as with one card.

This has convinced me that I finally need to update the rest of my system as I think the Core2Quad and dual 8x crossfire lanes are holding me back. The relevant parts of my current system:
Q9400 @ 3.8GHz
Asus P5Q-E (P45 chipset, 16x PCI-E for single card, 8x each for crossfire)
8GB Kingston HyperX 1066 DDR2
2 x XFX 5870 1GB
1 x 26inch DGM Monitor (1920 x 1200)
2 x 24inch Iiyama Monitors (1920 x 1080) - all three run at 1920x1080 for gaming in Eyefinity.

Now my dilemma is do I go for 1366 or for 1155? Sandy Bridge is obviously quicker, but it is limited in PCI-E lanes. Even if I went with a motherboard sporting an NF200, the CPU is still limited to 16x in total so I am not sure this is a viable solution. 1366 is older and slower, but has a better infrastructure for multi-card graphics. Sadly I haven't been able to find any reviews that actually compare Eyefinity Crossfire setups between the two chipsets.

All the benchmarks I've seen for PCI-E lane comparison shows little penalty with 8x/8x compared to 16x/16x, but they all say as resolution increases the penalty gets larger - I game at 5760x1080, so I guess that's me! :) I would prefer to go for the newer, faster CPU generation rather than one that is approaching EOL, but I am concerned that I will run into the chipset's limitations with my GPU setup and resolution. I realise I'm nowhere near cutting edge on anything, but it's still not quite a mainstream setup either.

Any advice, opinions, and relevant links very gratefully received.
 
1156 would be best bet if youre going to upgrade, but I doubt it will help, its still going to run gfx at x8/x8, though as you have found via research this makes very little difference (2% roughly) The stutter sounds like microstutter which you get with all multi gpu setups, if you really want to get rid of it your best bet would be to sell both 5870s and invest in a more powerful single card solution, eg 2gig 6950, its not much more powerful in raw performance but the additional memory should help you with your high res youre using
 
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