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GTX570 SLI in PCIE 8x8 bottleneck?

Last response: in Graphics & Displays
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February 10, 2011 4:57:11 AM

Hello, my first post!

I am planning to build a new system

Intel Sandy Bridge 2600K OC @ 4.0 GHz
2x4gb GSKILL Ripjaws X 1600 MHz 9-9-9-24
2 GTX 570 in SLI
1 PCI Soundcard
1 SSD
4 HDD
Corsair AX750 PSU

First, I'm not sure if PCIE 8x8 will be a bottleneck for GTX 570 in SLI. I heard some people saying GTX 580 in SLI will be limited by PCIE 8x8, but without any reference. If 8x8 is an issue, I would have to buy a premium motherboard with NF200 chipset (of course after the intel recall is over).

Second, will 750W be enough for my setup? I can get a really good deal on the AX750, but not sure if that will do the job. If not, what would be the minimum power requirement?? Say I overclock the GPU a bit too...??
a c 87 Î Nvidia
February 10, 2011 5:17:09 AM

The bottleneck should be minimal, maybe 2 or 3 % I believe. For 2 x 570s and overclocking I might just go with 850w just to be sure. Corsair, Seasonic, PC Power and Cooling, XFX and Antec are all top notch.
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February 10, 2011 5:18:18 AM

I would say that you might get a little BN. But Not too much. That PSU should be more like an 850 watter, even 850w is really close. I might even go 900-950w. I would go for dual GTX 560s if I were you. Maximum performance and good OC and good cooling. So I hope that answers your questions.
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February 10, 2011 5:19:12 AM

anort3 said:
The bottleneck should be minimal, maybe 2 or 3 % I believe. For 2 x 570s and overclocking I might just go with 850w just to be sure. Corsair, Seasonic, PC Power and Cooling, XFX and Antec are all top notch.

With 8x the hd5870 lost 2-3%, this card is much stronger, he would lose more performance.
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a c 87 Î Nvidia
February 10, 2011 5:22:01 AM

HostileDonut said:
I would say that you might get a little BN. But Not too much. That PSU should be more like an 850 watter, even 850w is really close. I might even go 900-950w. I would go for dual GTX 560s if I were you. Maximum performance and good OC and good cooling. So I hope that answers your questions.



You can run 2 x power hungry 480s on 850 watts. 850 is fine with some headroom for 570s.
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February 10, 2011 5:23:55 AM

A 850watter doesn't leave much and he wants to OC too. is leaves about 360w. That would probably do, but I would be safe. Plus the PSU would ramp up when playing games. (I hate that)
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a c 87 Î Nvidia
February 10, 2011 5:24:02 AM

HostileDonut said:
With 8x the hd5870 lost 2-3%, this card is much stronger, he would lose more performance.



Actually the card is not "much stronger" but it is a bit more powerful. He will still lose just a few percent.

http://www.tomshardware.com/reviews/radeon-hd-6950-1gb-...
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February 10, 2011 5:25:08 AM

Thanks for the answers gents. Is there any review on 8x vs 16x SLI for NVIDIA cards??
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February 10, 2011 5:28:30 AM

Maybe it is not alot stronger, but defiantly a difference. I noticed some flaws in that chart. The hd5850 is not stronger than the hd6870. Also the hd5870 x2 is not stronger than the hd6970. I am not sure I believe that chart. I would still go GTX 560 Ti's.
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a c 87 Î Nvidia
February 10, 2011 5:28:33 AM

Seems like Tom's did it somewhere but I can't find it.
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February 10, 2011 5:30:42 AM

donationbox said:
Thanks for the answers gents. Is there any review on 8x vs 16x SLI for NVIDIA cards??

Well, SLI doesn't really matter and neither does Nvidia. It is how fast and how much bandwidth a card needs and what the PCI-E slot can run at. If you want GTX 570s go ahead, just bigger PSU. I would get GTX 560Ti's because performance is great + you get all performance.
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a c 87 Î Nvidia
February 10, 2011 5:30:55 AM

HostileDonut said:
Maybe it is not alot stronger, but defiantly a difference. I noticed some flaws in that chart. The hd5850 is not stronger than the hd6870. Also the hd5870 x2 is not stronger than the hd6970. I am not sure I believe that chart. I would still go GTX 560 Ti's.



http://www.anandtech.com/bench/Product/295?vs=290

Pretty close. Tom's chart shows them as equals ..........
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February 10, 2011 5:32:03 AM

hd6870 = better though.
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a b Î Nvidia
February 10, 2011 5:34:28 AM

HostileDonut said:
hd6870 = better though.


We are talking like 3 fps average here....

You are still is not going to lose more than 3 percent in x8 as opposed to x16.
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a c 87 Î Nvidia
February 10, 2011 5:38:15 AM

Welcome to the forums donationbox. Usually we don't argue so much lol. I can tell you for sure you will like the i7 2600K!
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February 10, 2011 5:39:36 AM

anort3 said:
Welcome to the forums donationbox. Usually we don't argue so much lol. I can tell you for sure you will like the i7 2600K!

Yeah, haha, we really have different views here.
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February 10, 2011 5:56:10 AM

lol I was surprised to see 10 replies within 10 min of the start of the thread.
Anyways, I did a bit of research

http://www.hardocp.com/article/2010/08/23/gtx_480_sli_p...

480s in SLI @ 8x8 has literally no impact @ 2560x____ and it starts to show ~7% difference in 5760x____.

http://www.guru3d.com/article/geforce-gtx-570-sli-revie...

570s in SLI is slightly more powerful than 480s in SLI. I would assume 570s in SLI 8x8 will still have almost identical performance as 16x16 @ 2560x____ and will perform slightly worse (~10%???) @ 5760x____.
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a c 87 Î Nvidia
February 10, 2011 6:03:54 AM

Yeah as we said you only lose a few percent running x8x8 at most resolutions. What resolution are you going to be running at?
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a b Î Nvidia
February 10, 2011 6:04:05 AM

HostileDonut said:
Yeah, haha, we really have different views here.


I was never talking to the OP, when I said only 3 fps on average, I was posting in response to the discussion about the 5850 and 6870.

You said "6870 = better though" in responce to a benchmark of the 6870 vs 5850.

Also, I think you should check this out.

http://www.hardocp.com/article/2010/08/23/gtx_480_sli_p...

Keep in mind the GTX 480 is about equal in performance to a GTX 570.

http://www.anandtech.com/bench/Product/309?vs=306

You really think there is going to be a huge loss in x8x8 with GTX 570? No there will not, not at all.


EDIT - Look at that, Donation found that himself.

Point still stands.

donationbox said:

570s in SLI is slightly more powerful than 480s in SLI. I would assume 570s in SLI 8x8 will still have almost identical performance as 16x16 @ 2560x____ and will perform slightly worse (~10%???) @ 5760x____.


Yes you are correct in that assumption.

Also the AX750 will be fine.

http://www.overclock.net/power-supplies/905890-570-sli-...
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February 10, 2011 3:52:27 PM

Helltech, I completely disagree. Did you even look at the anandtech benchmark? BIG difference. HE will lose like 7-10% performance.
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