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Budget AMD crossfire MOBO

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December 31, 2010 1:53:26 AM

I am looking for a cheap as in around 100 dollars or whatever it takes to get a decent crossfire board. i am building a gaming/cad computer and plan to use a AMD 1055t cpu with starting out with a single gts 450 but in the future plan to get dual gpu's.

I want to know what boards you recommend for my application. if you need more info i can give more. i also intend to overclock the cpu and possible the graphics.
December 31, 2010 2:19:03 AM

will the pci x4 hurt gpu performance for that board.
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December 31, 2010 2:22:32 AM

That is a good board for only one gfx card, seeing that there is only 1 PCIe x16 slot, and another slot at x4. Not good for crossfire or sli.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

That board is the cheapest for full bandwidth crossfire/sli

also, OP you do realize that AMD boards dont officially support sli, and that you will need to use some "hacks" to get it to work? Its fine if you are willing to do that.
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December 31, 2010 2:45:52 AM

^ True, but what if OP decides to get 2 bigger gfx cards later?
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a b V Motherboard
December 31, 2010 3:25:09 AM

The difference is larger but not a necessary upgrade according to this review: http://www.tomshardware.com/reviews/pcie-geforce-gtx-48... note they are using 480s so the more powerful cards like the 5970 and 580 may show more of a change, especially the 5970 as it's a dual card already. However, they are also using an i7 at 4ghz, which will perform better in gaming than a 1055T, so more of the bottleneck will be on the processor anyways.
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December 31, 2010 3:46:45 AM

duk3 said:
The difference is larger but not a necessary upgrade according to this review: http://www.tomshardware.com/reviews/pcie-geforce-gtx-48... note they are using 480s so the more powerful cards like the 5970 and 580 may show more of a change, especially the 5970 as it's a dual card already. However, they are also using an i7 at 4ghz, which will perform better in gaming than a 1055T, so more of the bottleneck will be on the processor anyways.

reading that article i get the answer no. having a x16/x8 has minimal performance decrease with two cards. correct me if i read wrong. also you can have to cards or diferent types like a 5970 and 580 etc right?
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December 31, 2010 3:51:55 AM

i also plan to overclock to a fairly high speed so bottleneck should be that much of an issue i would think. like maybe to 3.8ghz i have heard that they go over 4 on air but i dont need all that extra power.
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a b V Motherboard
December 31, 2010 4:15:33 AM

Exactly, the article's results show that it's not necessary, especially as your gts450 is going to be less powerful than the 480, making it less of a bottleneck. I'm sure that the 1055t can keep the bottleneck on the GPU at 3.8, especially with the 450.

No, you can't use SLI on AMD motherboards unless you purchase a motherboard with a chipset from nvidia such as a 980a, however these motherboards don't have the best reputation, and are more expensive than what you are looking for. Additionally, you can't use AMD and Nvidia cards together unless you have a motherboard with a Lucid Hydra chip, which is new technology and therefore doesn't work well currently.
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December 31, 2010 4:44:11 AM

duk3 said:
Exactly, the article's results show that it's not necessary, especially as your gts450 is going to be less powerful than the 480, making it less of a bottleneck. I'm sure that the 1055t can keep the bottleneck on the GPU at 3.8, especially with the 450.

No, you can't use SLI on AMD motherboards unless you purchase a motherboard with a chipset from nvidia such as a 980a, however these motherboards don't have the best reputation, and are more expensive than what you are looking for. Additionally, you can't use AMD and Nvidia cards together unless you have a motherboard with a Lucid Hydra chip, which is new technology and therefore doesn't work well currently.


How does the Hydra chip being a new technology automatically make it not work well?

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December 31, 2010 6:43:58 AM

the Hydra chip is actually quite good, it's just that it's not compatible with all game and video cards.
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December 31, 2010 6:40:46 PM

I cannot give exact numbers, but x16/x4 crossfire (or sli) will never be recommended. you will see a performance drop in comparison to x16/x16 or even x16/x8
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December 31, 2010 6:52:40 PM

ok so i need to find a board that has x8/x8 or higher. x8/x8 are that much slower than x16/x16 according to the article. also i cant use the gts 450 with an amd board can i? will those be compatible?
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December 31, 2010 7:15:48 PM

AMD boards do not officially support SLI. You would have no problems running just one nvidia card though.

If you dont buy an amd mobo with an nvidia chipset (they suck, so you probably wouldnt), then you would have to use hacked drivers to get sli to work.
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December 31, 2010 8:24:05 PM

ok so i need to get an ati graphics card to get sli to work?
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December 31, 2010 8:27:35 PM

If you dont want to use hacked drivers then yes, you would need an ati card for out-of-the-box-ready crossfire.
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a b V Motherboard
December 31, 2010 9:02:49 PM

A 5770 is a good choice, it's faster than the gts450
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
After rebate it's $114
x8/x8 are not half the speed of x16/x16 relative to actual performance.
You won't see any performance decrease with a 5770, the cards aren't powerful enough to saturate x8.
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December 31, 2010 9:21:03 PM

how much better or worse will a 5770 be compared to duel 4830's
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a b V Motherboard
December 31, 2010 9:46:37 PM

A 5770 is about as fast as a gtx 260, which is faster than a 9800gx2, which is faster than dual 4830s, which means that the 5770 is faster or about the same speed, and allows future crossfire along with being more power efficient.
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December 31, 2010 11:17:01 PM

cbrunnem said:
how much better or worse will a 5770 be compared to duel 4830's


get the 5770, you won't regret it.

Plus it scales well in crossfire if you decide to get a second one in the future.
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January 1, 2011 8:49:41 AM

Definitely get the 5770 (or the 6850)
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January 1, 2011 6:22:00 PM
January 1, 2011 8:11:04 PM

solid hardware choices but with that case the PSU you chose will be blowing hot air into your case which is not very good.

I'd recommend spending a little more on your case/psu.
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January 1, 2011 10:37:18 PM

You should get the Cooler Master Elite 430
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