R9 290 (X) crossfire through pci-e 2.0 slots? - Overclock.net - An Overclocking Community

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R9 290 (X) crossfire through pci-e 2.0 slots?

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post #1 of 53 (permalink) Old 02-27-2015, 11:36 AM - Thread Starter
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Was just wondering about this. I was under the impression (lack of info) that IF i would buy two R9 290 X's for crossfire and put them in my current PC built around an Asus Maximus IV Extreme-Z motherboard, i would immediately bottleneck the PCI-E 2.0 slots, and the lanes of my i7 2700K.

Anyone have experience with similar setup to take away my worries?

Comparison with R9 290 X's crossfire on a PCI-E 3.0 board and a newer CPU?

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Workhorse PC: * Intel i7 2700K @ 4.8 Ghz * Noctua NH-D15 * Asus Maximus IV Extreme-Z * 32 GB Corsair Vengeance Pro CMY32GX3M4A1866C9 * Sapphire HD7970 crossfire * 3 x Dell U2410 @ Eyefinity 5760 x 1200 / 60Hz * Corsair HX 1000i * 7 x WD Black HDDs * Creative Soundblaster ZxR * Optiarc AD 5240S * Steelseries 7G * Razer Imperator 2012 * Steelseries 9HD * Coolermaster STC T01 * Edifier 730D * Windows 7 Ultimate x64 *
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post #2 of 53 (permalink) Old 02-27-2015, 11:38 AM
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nope no bottle neck 290x couldn't saturate a 16x 1.0 slot
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post #3 of 53 (permalink) Old 02-27-2015, 11:48 AM - Thread Starter
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Quote:
Originally Posted by Master__Shake View Post

nope no bottle neck 290x couldn't saturate a 16x 1.0 slot
Thanks, but
I'm talking about TWO 290X'es. And an old i7 2700 K (@4.8 Ghz though) to coordinate the crossfire - fires....

My real name is Blín D'ñero.

Gaming PC: * Intel i7 4790K * Noctua NH-D15S * Asus Maximus VII Hero * 32 GB Corsair Dominator Platinum CMD32GX3M4A2133C9 * 2 × Sapphire Radeon R9 290 Tri-X in crossfire * Dell U3010 @ 2560 x 1600 / 60Hz * Corsair AX 1200W * 7 x WD Black HDDs * Creative Soundblaster ZxR * Asus DRW F1ST * Corsair K95 RGB * Corsair M65 PRO RGB * Steelseries 9HD * Coolermaster STC T01 * Edifier S530 * Sennheiser HD598 * Windows 7 Ultimate x64 *

Workhorse PC: * Intel i7 2700K @ 4.8 Ghz * Noctua NH-D15 * Asus Maximus IV Extreme-Z * 32 GB Corsair Vengeance Pro CMY32GX3M4A1866C9 * Sapphire HD7970 crossfire * 3 x Dell U2410 @ Eyefinity 5760 x 1200 / 60Hz * Corsair HX 1000i * 7 x WD Black HDDs * Creative Soundblaster ZxR * Optiarc AD 5240S * Steelseries 7G * Razer Imperator 2012 * Steelseries 9HD * Coolermaster STC T01 * Edifier 730D * Windows 7 Ultimate x64 *
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post #4 of 53 (permalink) Old 02-27-2015, 11:59 AM
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Quote:
Originally Posted by CurvedLine View Post

Thanks, but
I'm talking about TWO 290X'es. And an old i7 2700 K (@4.8 Ghz though) to coordinate the crossfire - fires...

nope still no bottle neck

also lol at 2700k being old.
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post #5 of 53 (permalink) Old 02-27-2015, 12:42 PM - Thread Starter
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So you, Master___Shake, state hereby (because you are informed more than i at this moment biggrin.gif) that IF i would replace my reference HD7970 crossfire by 2 Sapphire R9 290 Tri-X's in crossfire in my OLD x68 Asus Maximus IV Extreme-Z (it has 16 GB Corsair Dominator GT CMT16GX3M4X2133C9) with an i7 2700K @ 4.8 Ghz, my "gaming PC" in my sig, .............
that they would operate to their full potential and not suffer bottleneck being a waste of money because i should have built a new PC around a MODERN motherboard carrying PCI-E 3.0 slots and latest i7 type CPU?

Why i'm asking:
from my old x58 board (my "workhorse" pc), the XFX 7970 card has been accepted for RMA and i will receive (with a little extra pay) a Sapphire R9 290 Tri-X in return.

So i have been thinking: hmm... if i would order a second one of that Sapphire R9 290, i could upgrade my gaming PC with the new R9 290 pair, and move that reference 7970 pair from my gaming PC to my workhorse PC, why not?

But would that be sensible towards my gaming PC? Would it be an upgrade on an old x68 / PCI-E 2.0 motherboard / i 2700 @ 4.8 Ghz --- worth the money???

[EDIT: not meant to make it personal to Master___Shake. Anybody with ideas is invited to chime in. /edit] thumb.gif

My real name is Blín D'ñero.

Gaming PC: * Intel i7 4790K * Noctua NH-D15S * Asus Maximus VII Hero * 32 GB Corsair Dominator Platinum CMD32GX3M4A2133C9 * 2 × Sapphire Radeon R9 290 Tri-X in crossfire * Dell U3010 @ 2560 x 1600 / 60Hz * Corsair AX 1200W * 7 x WD Black HDDs * Creative Soundblaster ZxR * Asus DRW F1ST * Corsair K95 RGB * Corsair M65 PRO RGB * Steelseries 9HD * Coolermaster STC T01 * Edifier S530 * Sennheiser HD598 * Windows 7 Ultimate x64 *

Workhorse PC: * Intel i7 2700K @ 4.8 Ghz * Noctua NH-D15 * Asus Maximus IV Extreme-Z * 32 GB Corsair Vengeance Pro CMY32GX3M4A1866C9 * Sapphire HD7970 crossfire * 3 x Dell U2410 @ Eyefinity 5760 x 1200 / 60Hz * Corsair HX 1000i * 7 x WD Black HDDs * Creative Soundblaster ZxR * Optiarc AD 5240S * Steelseries 7G * Razer Imperator 2012 * Steelseries 9HD * Coolermaster STC T01 * Edifier 730D * Windows 7 Ultimate x64 *
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post #6 of 53 (permalink) Old 02-27-2015, 12:45 PM
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You will have like 5% less performance at most than you would have gotten if you had 3.0 slots with a 3.0 capable CPU. It's really not much of a difference.


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post #7 of 53 (permalink) Old 02-27-2015, 12:51 PM
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You'll be good, I have a 2500K @ 4.5 and CrossfireX VAPOR R9 290X's on an ASUS Maximus GENE V Z77 board


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post #8 of 53 (permalink) Old 02-27-2015, 02:47 PM
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The performance difference could be 2-5% at 1600p or slighly higher if you run a higher resolution,that 2-5% is fine
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post #9 of 53 (permalink) Old 02-27-2015, 04:05 PM
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The performance difference is negligible. As people say, between 2-5%. We had also compared it using a 295X2.

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post #10 of 53 (permalink) Old 02-27-2015, 04:38 PM
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yep still no bottle neck.

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