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5750 or 5770 X2 in Crossfire VERSUS 5870 or 285 single?

Last response: in Graphics & Displays
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December 27, 2009 12:44:39 PM

Hi, now that I've got COD:MW2 and see how amazing it is even at crappy settings, my quest to build a new gaming rig has just been rushed to the top of my list of things to do. But I've got a few questions still, and what better place to seek help than this great forum, so here goes....

I'm not going to spend $400+ on a single graphics card that will be roflstomped by something new in 3 months.

So I was kinda leaning towards something like a HD 5750 or 5770 because...

A: They are DX11 cards with 1GB DDR5 memory, aka new generation albeit midrange
B: They are approximately $140 and $170, respectively
C: Benchmarks of the single cards are pretty impressive, as I found at THIS PAGE.

But let me spell out my goal very clearly. I hear that 70FPS in First Person Shooters like MW2 make the aiming really precise and everything is nice and smooth. I see that on the linked Benchmarks page, the top performing 5870 has a minimum FPS of around 70FPS. But my question, and forgive my newbie logic if it is flawed, is that if a single 5770 can score a 65.2 (Avg) and 48 (Low/Minimum) in terms of FPS on MW2, wouldn't two of them surely be able to outperform or at least be very very close to the 102 (Avg) and 70 (Minimum) score that the 5870 got? Could two 5750's do so as well? If my goal was to play MW2 and not really ever dip below 70 FPS, wouldn't I be better off spending $280 or $340 instead of $450, assuming I could even find a place that had a 5870 IN STOCK?

Please englighten me and tell me WHY I'm right or wrong. Hard proof and/or benchmark evidence would be great, I've looked but can't really find a good way to compare two 57 series cards in crossfire to a single 5850/295/whatever. Please help me out. :) 

EDIT: Also, on that benchmark link, you may have to click the 1680X1050 resolution to see the numbers I was getting. It's the resolution I'll be gaming at, unless I find out that there's a big difference between 1900X1200 and 1680X1050, such as 1050 CANNOT play true HD, which yes, I know it can't, but I guess the question regarding that that I've tried to ask before and never got an answer is that: Is the difference between 1050 and 1080 about the same difference between 1080 and 720, or is it really just a few less pixels? Like if I watched a 1080 HD video, would it degrade all the way down to 720 or just resize a bit to display the max that my monitor will display? Bonus points for helping me understand this subquestion a bit better.
a c 376 U Graphics card
December 27, 2009 4:11:47 PM

At that res just get one HD5770. It should be great. If you find it lacking for some reason(doubtful) you can always get another for performance close to an HD5870 for $100 less.
Video will play at whatever your resolution is. Your resolution is almost double 720p which is 1280x720
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December 27, 2009 5:01:15 PM

Thanks a bunch for the input. I'll probably end up getting a 5770 and only buying another one if I run into graphics lag problems with maxed settings. That benchmark report was great, thanks a lot for the link. And thanks for clearing up the confusion I had about my 1680X1050 resolution. You guys are always great and your help is appreciated. :) 
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a b U Graphics card
December 27, 2009 5:57:37 PM

i opted for a single 5850 instead of 2x5770 . the 5850 outperforms the twin 5770's in games that dont scale well , and still gives enough performance in game that do scale in spite of performing less then them ... also , twin 5770's are lot costlier than 5850's .
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a c 228 U Graphics card
December 27, 2009 6:19:38 PM

I'd look in the Bolded area:

http://www.tomshardware.com/reviews/geforce-310-5970,24...

Here's the "winners" from THG's latest (December) GFX Roundup
Best Graphics Cards For The Money: December '09

$50 - HD 4650
$65 - HD 4670 / 9600 GSO
$85 - 9600 GT
$95 - 9600 GT / HD 4830
$110 - GTS 250 512 MB
$120 - GTS 250 1 GB
$155 - HD 5770 / GTX 260
$200 - HD 4890
$240 - 2 x GTS 250

$310 - No winner (HD 5850 Honorable Mention)
$330 - 2 x GTX 260 / 2 x HD 5770
$400 - 2 x HD 4890
$410 - No winner (HD 5870 Honorable Mention)
$465 - No winner (GTX 295 Honorable Mention)
$625 - No winner (HD 5970 Honorable Mention)
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a c 376 U Graphics card
December 27, 2009 6:54:12 PM

cyberkuberiah said:
i opted for a single 5850 instead of 2x5770 . the 5850 outperforms the twin 5770's in games that dont scale well , and still gives enough performance in game that do scale in spite of performing less then them ... also , twin 5770's are lot costlier than 5850's .

Crossfired HD5770s perform closer to an HD5870, and they are barely more expensive than the HD5850. Also he is using 1680X1050.
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a b U Graphics card
December 27, 2009 11:54:17 PM

A 5770x2 is just a 5870.
A 5770 performs the same as a 4870, and a 4870x2 performs the same as a 5870.

The 5850 beats the GTX285, and the 5870 curb stomps the GTX285.
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a b U Graphics card
December 28, 2009 6:06:38 AM

yeah but in india , 5770 x2 was gonna cost me much more than 5850 ... that why i went for it . 5870 was outta budget .
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