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Crossfire or 5970?

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December 9, 2009 9:48:49 PM

Is it better to crossfire two ati 5870's or just use one 5970?

More about : crossfire 5970

December 9, 2009 10:06:00 PM

If it was available (motherboard etc) and I had the money I'd rather have 5870s in crossfire, but if you cant crossfire or afford 2 5870s (they're about $200 more then a 5970) then I'd advice the 5970. The 5970 perform about the same as a 5850 x2 but OC well and ATI basically said "overclock this *** to the max" so they have the room to perform as well as 2 5870s, not like the 5870s cant overclock either but apprently their bad at it.
but which ever1 you buy will blow away all games for a good while!
a c 169 U Graphics card
December 10, 2009 6:11:43 AM

One HD 5790 perform pretty much like 2 HD 5850's which are about 10% slower than 2 HD 5870's in CrossFire,with either 1 HD 5790 or 2 HD 5870s you can max out every game out there.
As impaledmango said,it depends on your other specs too,the advantage of single 5970 is that it requires 1 PCI-E 16x slot where as for 2 HD 5870's you need a CrossFire motherboard.
Also for now,only HD 5970 supports CrossFire and eyefinity.
So if the price difference is like $200 as impdelmango said,i would choose 1 HD 5970 because its not worth it to pay $200 more and get about %15 more performance IMO.
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a b U Graphics card
December 10, 2009 8:38:11 AM

its better to go for a single 5970 for following reasons
1.lower power consumption than two 5870,therefore less heat
2.CPU bottleneck is minimum
3.spend the extra money saved from non CF mobo to buy a better processor.
4.since the 5970 runs at lower clock speed than 5870 so u can easily overclock a 5970 without any fear.. :sarcastic: 
December 10, 2009 12:49:21 PM

sayantan said:
its better to go for a single 5970 for following reasons
1.lower power consumption than two 5870,therefore less heat
2.CPU bottleneck is minimum
3.spend the extra money saved from non CF mobo to buy a better processor.
4.since the 5970 runs at lower clock speed than 5870 so u can easily overclock a 5970 without any fear.. :sarcastic: 


What do you mean by "CPU bottleneck is minimum" ? Both 5970 and 5870 CF will be bottlenecked by anything less than a powerful quad core.
a b U Graphics card
December 10, 2009 1:38:15 PM

basket687 said:
What do you mean by "CPU bottleneck is minimum" ? Both 5970 and 5870 CF will be bottlenecked by anything less than a powerful quad core.


yup u r right but still a dual gpu 5970 would cause a lesser cpu bottleneck than two discrete 5870 in CF
a b U Graphics card
December 10, 2009 2:00:11 PM

sayantan said:
yup u r right but still a dual gpu 5970 would cause a lesser cpu bottleneck than two discrete 5870 in CF


Only beacuse it is slower....
a c 125 U Graphics card
December 10, 2009 4:07:28 PM

seems a pretty obvious choice

5970 needs less power, less heat than 2 x 5870's, its cheaper, your only using one PCI-E lane and you could just overclock the 5970 to 850 core and 4800 mem.
a b U Graphics card
December 10, 2009 5:20:42 PM

Rustyy117 said:
seems a pretty obvious choice

5970 needs less power, less heat than 2 x 5870's, its cheaper, your only using one PCI-E lane and you could just overclock the 5970 to 850 core and 4800 mem.


Not nearly as easy as it might seem. While the GPU cooling and the card itself can easily take the higher clocks the cooling on the VRMs is not nearly sufficient for overclocking. It is in no way for sure that you can get it to 5870 clocks, though generally likely.
a c 125 U Graphics card
December 10, 2009 7:03:44 PM

yeah those VRM's get pretty toasty.

maybe with the money saved from going with a 5970 and not 2 x 5870's the OP could invest in a water loop for his 5970, just an idea. (although im not sure if any GPU waterblocks have come out for the 5970 yet)
December 10, 2009 10:55:04 PM

Thanks i would go with a 5970 but i don't think i would get one even if i gave my life savings to ati themselves
December 10, 2009 11:21:06 PM

5970 Water block is available at Danger Den for $129.99

http://www.dangerden.com/store/dd-5970-water-block.html

$129 + a few more hundred for a custom water cooling setup make the 5870s more attractive. Buying a 5970 for $600 then spending over $400 to attempt to reach the clocks of Standard 5870s is a high price to pay. The 5870s can also be overclocked as well so the gap in performance will grow.

A powerful CPU is needed to utilize the GPUs to their fullest. Even a highly overclocked i7 can potentially limit a high end GPU setup such as that.

But before we get into that. What are your system specs? What resolution do you run games at?
a b U Graphics card
December 11, 2009 4:55:52 AM

daedalus685 said:
Only beacuse it is slower....

Not becoz it is slower but because the two gpu are using same pci-e lane
December 11, 2009 5:26:49 AM

sayantan said:
Not becoz it is slower but because the two gpu are using same pci-e lane


No, it's because the clocks are lowered on the 5970 to stay under the 300W limit. If the clocks were raised, it would go above the limit and not be under the PCIe standard. The PCIe Gen 2 x16 slot has an enormous amount of bandwidth. PCI-e Gen 2 has 500MB/s per lane. This is a x16 lane, so 16 * 500MB/s = 8GB/s. I don't think a 5970 is limited by the PCIe lanes just yet.
a c 125 U Graphics card
December 11, 2009 8:03:50 AM

one-shot said:
5970 Water block is available at Danger Den for $129.99

http://www.dangerden.com/store/dd-5970-water-block.html

$129 + a few more hundred for a custom water cooling setup make the 5870s more attractive. Buying a 5970 for $600 then spending over $400 to attempt to reach the clocks of Standard 5870s is a high price to pay. The 5870s can also be overclocked as well so the gap in performance will grow.

A powerful CPU is needed to utilize the GPUs to their fullest. Even a highly overclocked i7 can potentially limit a high end GPU setup such as that.

But before we get into that. What are your system specs? What resolution do you run games at?


5870's will also be limited by VRM temps. If the OP has $600 to spend on a GPU alone, then I'm sure he has money to spend on good cooling.

December 11, 2009 9:58:20 PM

That may be true, but 2 5870s will be a better choice if one wants maximum performance. The value of that won't be as much as a single 5970, so he'll have to make the choice.
a c 169 U Graphics card
December 12, 2009 6:19:55 AM

+1^
2 HD 5870s perform better than 1 HD 5970 but the difference isn't much,so if you go with a 5970,it uses less power and only one PCI-E slot
a c 125 U Graphics card
December 12, 2009 8:06:47 AM

I guess the OP's motherboard has alot to do with the choice say for example his motherboards PCI-E lanes went like this

============= (PCI-E 1)
===PCI
===PCI
============= (PCI-E 2 )

Crossfire would be good because the first 5870 would get enough cold air to cool itself, but if there's only 1 PCI lane between the 2 PCI-E lanes then the first card is going to get very hot.

So that begs the question, OP,.what motherboard do you have?
!