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Radeon 5770x5750 Asymmetric Crossfire

Last response: in Graphics & Displays
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a b U Graphics card
February 28, 2010 10:38:54 PM

Hey all- I'm currently running a 4870 (you can see the rest of my system specs in my sig). Anyway- I now have a 5750. Obviously the 5750 is slower than my 4870, and I don't want to lose FPS "upgrading", but I really do want to give DX11 and Eyefinity a go, so I was thinking about Crossfire.

My real question is- should I get seconds 5750, or should I pair it with a 5770? Will the 5770 give me more performance than a 5750 or will it just end up causing stuttering or not scale properly? Will it give me enough of a performance boost over a second 5750 to justify the extra ~$20? I've done some searching but haven't been able to find any info about the asymmetrical Crossfire other than that it is possible.
February 28, 2010 10:48:07 PM

You might be pleasantly surprised by how well a 5750 copes with eyefinity. A 5770 will be slowed down to the same speed as your 5750 in crossfire.

I recommed you get your eyefinity fixed up first of all, then if you need another card go for it.
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a b U Graphics card
February 28, 2010 10:51:23 PM

The problem with that is, I'm already pushing my 4870 pretty hard with some of my games as I like to really crank the details and settings all the way up. A single 5750 on my 1920x1080 monitor will end up making me drop some settings down (and that is WITHOUT eyefinity).
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February 28, 2010 11:08:36 PM

I have a 5770 and three eyefinity monitors of 1680x1050, that is 529200 pixels. You would think that all games run terribly, and I also thought that before I tried it out.

I used to think that 60fps was the lowest I could accept, but since trying out eyefinity i have started to accept 30fps as very acceptable. It isn't easy to explain, but when you have the peripheral vision you concentrate much less on the center of your main screen, and you dont notice the fps drop the way you do with one center screen.

The fps is very consistent too and that might help. I think this is because the graphics card is the bottleneck at all times and it is working maxed out all the time. If you want to try out eyefinity, I sure do recommend you try it out with the 5750 first of all. If you need another card after that, it's an easy upgrade.
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a b U Graphics card
March 1, 2010 2:44:47 AM

I'm sure I could handle 30+ FPS, but when I'm running 1920x1080 at 40ish FPS with my 4870, then I know I'm not gonna be running 30+ with a 5750 at Eyefinity resolutions. I understand your point, and thats fine, but really, it doesn't answer my question at all. My question is, for a second card, should I crossfire the 5750 with another 5750 or with a 5770?
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a b U Graphics card
March 1, 2010 2:59:04 AM

You can crossfire a 5770 and a 5750 together but, I see no point in doing so. The 5770 would down-clock to the 5750s speeds, thus you have essentially wasted the price difference in getting the 5770. (unless you managed to overclock the 5750 to 5770 speeds before you activated crossfire.)
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a b U Graphics card
March 1, 2010 2:15:18 PM

Even if it down-clocked, wouldn't it still be faster due to the extra SP's and stuff?
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March 1, 2010 3:04:59 PM

Quote:
A 5770 will be slowed down to the same speed as your 5750 in crossfire.
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March 1, 2010 3:14:09 PM

I'm not sure what the fasination with crossfire is.

why not just purchase one faster card.. half the time crossfire has issues with new games until they update the drivers anyway.

its pretty much a bad idea to crossfire non-identical video cards.

If you have money to buy a 5750 and a 5770

thats 140$ for a 5750 and 175$ for a 5770

go buy a nice 280$-300$ 5850 and you can then add a second one in the future if you wish to.

or you can buy one 5770 and add a second one if you need to.

I doubt you would be happier with 2 5750's than a 5850 and thats how much you would be paying with no upgrade path.
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a b U Graphics card
March 1, 2010 3:40:14 PM

It comes down to getting a 5750 as a gift, which would mean selling it, probably for less than I could buy it for which doesn't really make much sense. So for me, I could spend $140 total and get a 5750 crossfire setup, rather than spending $300 for a 5850. Even selling the 5750, I'd still end up spending at least $180-200 for a 5850 which is more than another 5750, and not quite as fast.
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a b U Graphics card
March 1, 2010 5:13:03 PM

The thing is Rand_79 that not everybody has the money to spend on a 5850 upfront. They may only have half that amount and can only afford a 5770, then in 4-6 months they have enough funds to get another. I might hear you say "just save up for the 5850", well depending on how fast the OP can gather funds that could take many months, many months that the OP could be spending playing his games on a 5770. Crossfire just allows people on a budget to gain a massive performance boost without having to spend the big bucks on a newer single powerful card to replace their old one, like in the pre crossfire days. And it also adds a lot of flexibility to what you can do for future upgrades.
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a b U Graphics card
March 7, 2010 11:30:31 PM

Best answer selected by flyinfinni.
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a c 376 U Graphics card
March 8, 2010 12:26:35 AM

There's no need to "save up" for an HD5850. If you aren't familiar with it I recommend checking out a site called Ebay. Ebay your HD5750, heck, why not the HD4870 too? You should end up with at least $250, probably a bit more. If you were going to spend $160 on an HD5770 you must certainly have the $50 over that to buy yourself a nice new HD5850.
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