4gb 7750 or 1gb 7770 for eyefinity/fps

Forgot to say as well as the radeon 6850

They both could probably run at that resolution but not on high graphics. I don't know for sure, but I think the 7770 is basically a re-badged 6770, which is still good, but cannot run games very high. I would say go for a higher end card. Save your money. Cross fire doesn't really help that much and it's a lot more complicated. so unless you have a lot of spare time and patience, just get like a 7850 or something

I tried bf3 with a 6770 and 2.66 dual core and it was hellish. At 1080 with all settings low, it was a lag fest. If you have an overclocked quad core2 (or a sb/ib cpu) you may get by. That was the final straw in buying a whole new pc.

The Radeon 7770 or 6850 is not fast enough to drive a decent framerate at eyefinity resolution, the only games that possibly could be playable, is games like the original Half-Life, which is on an old engine, and requires hardly anything to run.

on a 7770, you could play BF 3 on high with passable fps on 1080p. If not maybe medium. Get that instead. Don't crossfire 2 low end cards, its a waste of money. Instead buy a cheaper motherboard and cheaper psu and get a 7850 or 7870 instead.

If you want eyefinity, neither will be good for gaming.

Not at Eyefinity res, on a single screen, yes just about.

Here is some BF3 testing i conducted using FRAPS.

OK, the maximum stable OC i achieved on stock voltages is 1230mhz on the core, 1550mhz on the memory with a board power limit of +20.

This result is at the stock clocks
1020mhz core
1300mhz memory
Board power 0%

Test conducted under firestorm 64 man for 10 minutes.


BF3 results using FRAPS:


Frames, Time (ms), Min, Max, Avg
20936, 333795, 10, 147, 62.721

A 7770 is a completely new card, the 5700 series were rebranded to 6700. HD7700 are built on GCN architecture and the shaders are completely different.

forget eyefinity with those cards, even in crossfire. Infact, forget crossfire all together unless you have 2 x 7950's or 7970's. crossfire doesnt work well on low end or mid range cards, it will only lead to fps drops and microstuttering. if you want to run a single 1gb 7770 that is fine for bf3 1080p medium detail settings. i have never heard of a 4gb 7750, but 4gb ram on such a low end card is a total waste, by the time you cranked the details up to use even more than 1gb vram, it would be too much for the gpu to process and you would get really low fps. stock with a single 7770 and when you want to upgrade, sell it and get a better single card.