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5970/5870 ok with Sandy Bridge 16x pci-e?

post #1 of 11
Thread Starter 
Hi all,

I have an asus ares (5970) that I want to crossfire with a 5870. I need a new mobo to do so. However, the Sandy bridge 8x/8x limitation is concerning. I have three four choices:

1. $180 2500k, with a $360 Asus Maximus IV.
2. $180 2500k with a ~$200 z68 mobo
3. $260 FX-8150 w/ a ~$200 990fx mobo.
EDIT: 4. $200 i7-970 w/ a $200 x58 mobo.

Please, DO NOT start any "faildozer" bickering. I am aware of the limitations of both, which is why I am leaning towards the i5.
That said - would I be ok with a regular z68 mobo? I am ok with saving $160 in exchange for a ~5% performance loss, but ~15% would be hard to swallow.
post #2 of 11
Quote:
Originally Posted by Tabzilla View Post
Hi all,

I have an asus ares (5970) that I want to crossfire with a 5870. I need a new mobo to do so. However, the Sandy bridge 8x/8x limitation is concerning. I have three four choices:

1. $180 2500k, with a $360 Asus Maximus IV.
2. $180 2500k with a ~$200 z68 mobo
3. $260 FX-8150 w/ a ~$200 990fx mobo.
EDIT: 4. $200 i7-970 w/ a $200 x58 mobo.

Please, DO NOT start any "faildozer" bickering. I am aware of the limitations of both, which is why I am leaning towards the i5.
That said - would I be ok with a regular z68 mobo? I am ok with saving $160 in exchange for a ~5% performance loss, but ~15% would be hard to swallow.
I assume since you price the i5 at 180 I assume you mean MC, so just get the z68 mobo with a 220 i7 2600k after the 80 bucks off combo. I would've gone that route if the price difference would've been under 50 bucks but at the time the CPU would've been $40 more and the eligible boards they had in stock where $70+ more than the price I got my board for.

*edit* I just realized I didn't answer your question about 8/8. Yeah you'll be fine nothing outside of 6990/590 gets affected by more than like 4-5% from 16/16 to 8/8
Edited by Junkboy - 10/20/11 at 6:48am
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Ada
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post #3 of 11
I would have to say you should be fine if you are worried about lanes dropping performance. Either way it will be a upgrade from the current rig your running.
 
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post #4 of 11
Thread Starter 
Thanks for the responses. I didn't know Mc still had that deal going on-thanks for the reminder!
Just to be clear- won't running my 5970 on an 8x lane be equivalent to running two 5870s on 4x each? If so, the consensus is that I'm looking <10% performance hit?

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post #5 of 11
that is a good question idk I am looking that up right now and it does not seem that easy lol
 
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post #6 of 11
Thread Starter 
Quote:
Originally Posted by terraprime View Post
that is a good question idk I am looking that up right now and it does not seem that easy lol
Haha, no it's not...most of the pci-e lane studies I found use single-gpu cards.
post #7 of 11
http://forums.anandtech.com/showthre...0#post30649234 ok that is the best answer I have found but it still does not give a full answer lol.
 
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post #8 of 11
Quote:
Originally Posted by Tabzilla View Post
Thanks for the responses. I didn't know Mc still had that deal going on-thanks for the reminder!
Just to be clear- won't running my 5970 on an 8x lane be equivalent to running two 5870s on 4x each? If so, the consensus is that I'm looking <10% performance hit? Sent from my Gummy Charged GBE 2.0 using Tapatalk
No, it doesn't work that way and it will still be running at x8 bandwidth. The two GPUs in the 5970 are connected with PLX bridge chip. This chip supports 3 PCIe x16 links, one to each of the GPUs, and the third PCIe x16 to PCIe x8 slot of the host system (motherboard). In another words, the two GPUs are not directly linked to the motheboard PCIe slot but thru this bridge link. The limitation is the motherboard PCIe x8 bandwidth is slower than PCIe x16.

For easier comparison: if single-GPU card runs slower by 5% at PCIe x8 compared to PCIe x16 so does a dual-GPU card, such as a 5970.
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post #9 of 11
Seen this?
even in a worst case senario, 4x isnt that bad

http://www.techpowerup.com/reviews/A...Scaling/7.html
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post #10 of 11
Quote:
Originally Posted by Ken1649 View Post
No, it doesn't work that way and it will still be running at x8 bandwidth. The two GPUs in the 5970 are connected with PLX bridge chip. This chip supports 3 PCIe x16 links, one to each of the GPUs, and the third PCIe x16 to PCIe x8 slot of the host system (motherboard). In another words, the two GPUs are not directly linked to the motheboard PCIe slot but thru this bridge link. The limitation is the motherboard PCIe x8 bandwidth is slower than PCIe x16.

For easier comparison: if single-GPU card runs slower by 5% at PCIe x8 compared to PCIe x16 so does a dual-GPU card, such as a 5970.
Awesome kinda wondered if that chip matter in controlling anything in relation to the speed of the pcie slots speed.
 
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