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Gigabyte 7990 Questions, Comparison to R9 295X2.

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  • Gigabyte
  • Graphics
Last response: in Graphics & Displays
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August 3, 2014 4:16:35 AM

So I was looking at an R9 295X2 and I was told they require "supporting PSu's" so only certain PSu's can support them.

Does this also apply to the 7990?

More about : gigabyte 7990 questions comparison 295x2

August 3, 2014 4:44:20 AM

They don't require any special PSUs, all they need is enough wattage from a quality PSU.
I'd recommend 700W or more for the 7990 and 1000W for the 295X2.
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August 3, 2014 4:47:07 AM

No, The 7990 will run on any psu that has the right wattage, The R9 295X2 Requires specific psus because it has 2 built in gpus on the board.
For the power supply i recommend a http://pcpartpicker.com/part/evga-power-supply-220g2085...
It supports both and has:
10 Year warranty,
Great customer service,
80+ Gold,
Fully Modular,
Excellent build quality,
Panda Friendly Eco mode,
And 90% Average Efficiency.
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August 3, 2014 6:57:33 AM

Littlesackninja said:
No, The 7990 will run on any psu that has the right wattage, The R9 295X2 Requires specific psus because it has 2 built in gpus on the board.
For the power supply i recommend a http://pcpartpicker.com/part/evga-power-supply-220g2085...
It supports both and has:
10 Year warranty,
Great customer service,
80+ Gold,
Fully Modular,
Excellent build quality,
Panda Friendly Eco mode,
And 90% Average Efficiency.


Does the 7990 not have 2 built in GPU's on the board? I thought it was 2 7970's on the same board...
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August 3, 2014 9:16:40 AM

ZerkaaHD said:
Littlesackninja said:
Ahh i was mixing it up sorry, Here: http://www.scan.co.uk/products/750w-seasonic-g-series-h...
That power supply and the one i linked before both support it anyway. The R9 295x2 is more complex.


So would the XFX 850W Not support it?


? can you link me that psu, I recommend a EVGA SupernovaG2 750w as it supports your card.
Or the power supply i most recently linked.

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August 3, 2014 11:21:30 AM

Littlesackninja said:
ZerkaaHD said:
Littlesackninja said:
Ahh i was mixing it up sorry, Here: http://www.scan.co.uk/products/750w-seasonic-g-series-h...
That power supply and the one i linked before both support it anyway. The R9 295x2 is more complex.


So would the XFX 850W Not support it?


? can you link me that psu, I recommend a EVGA SupernovaG2 750w as it supports your card.
Or the power supply i most recently linked.



http://www.amazon.co.uk/XFX-P1-850S-NLB9-PRO850W-Editio...

£80 from amazon themselves.
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August 3, 2014 11:25:13 AM

The 850w i linked before is the best power supply here, I highly suggest it.
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August 3, 2014 1:16:22 PM

Here is Guru3D's power supply recommendation:
•AMD R9-295x2 - On your average system the card requires you to have a 850~1000 Watt power supply unit.
•AMD R9-295x2 Crossfire - On your average system the cards require you to have a 1250 or higher Watt power supply unit as minimum.

If you are going to overclock GPU or processor, then we do recommend you purchase something with some more stamina.
http://www.guru3d.com/articles_pages/amd_radeon_r9_295x...


Here is Guru3D's power supply recommendation:
•Radeon HD 7990 - On your average system the card requires you to have a 750 Watt power supply unit.
•Radeon HD 7990 Crossfire - On your average system the cards require you to have a 1000 Watt power supply unit as minimum.

If you are going to overclock GPU or processor, then we do recommend you purchase something with some more stamina.
http://www.guru3d.com/articles_pages/radeon_hd_7990_rev...


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August 3, 2014 1:51:41 PM

Will the i5 4440 bottleneck the 7990?

Also what does a PSU need to support a dual GPU ?

I don't see a difference really between the Supernova G2 EVGA 750W and hte XFX 850W except a £15 price tag.

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August 3, 2014 1:53:46 PM

ZerkaaHD said:
Will the i5 4440 bottleneck the 7990?

Also what does a PSU need to support a dual GPU ?

I don't see a difference really between the Supernova G2 EVGA 750W and hte XFX 850W except a £15 price tag.




No, The 4440 will be fine with the 7990.
The Power Supply i linked before ( http://pcpartpicker.com/part/evga-power-supply-220g2085... ) Supports that card.
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August 3, 2014 1:54:08 PM

Some psu's dont suport the Hd 7990
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August 3, 2014 4:43:16 PM

Littlesackninja said:
Some psu's dont suport the Hd 7990


Yeah I understand that but I want to know SPECIFICALLY what they need to support dual GPU's.

the XFX 850W has 6 PCIE 6+2 connectors,

the 7990 only need 2 8 pin connectors, so why would the XFX 850W not support it?
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August 3, 2014 11:11:48 PM

You do realize that the 7990 was a terrible and fatally flawed card that was discontinued after only two months on the market, don't you? The list of problems includes: heat, noise, coil whine, and poor driver support.
http://www.tomshardware.com/reviews/radeon-hd-7990-cros...
http://www.techpowerup.com/reviews/AMD/HD_7990/31.html

Quotes:
"However, we've also seen many games that do not scale well, and they make up a significant portion of our tests. Out of eighteen titles, five did not scale, or worse, showed negative scaling. These are not small titles, but big AAA games: Assassin's Creed 3, Batman: Arkham City, F1 2012, StarCraft II, Skyrim, and World of Warcraft. What really surprises me is that this long list is the same as the one we had with our reviews of HD 7990 "New Zealand" implementations by board partners, like the ASUS ROG ARES II and PowerColor Devil 13. So either AMD does not care or can't fix CrossFire support with these games millions of people play."

"What is a major issue, though, is the extremely annoying coil whine the card emits as soon as it runs a 3D application. The whine is generated by resonating power circuitry coils and is a problem that can be resolved; it's just an engineering challenge. NVIDIA did so for the GTX 690 and GTX Titan; both cards don't have such coil whine issues. On the HD 7990, however, it is very apparent, and I don't understand how AMD missed such a glaring problem. I talked to five other reviewers and they all confirm it, so it's not an isolated issue. What makes the whine even more apparent is that it is constantly changing pitch and volume, drawing your attention to it by effectively overpowering the fans' "whoosh" sound."
http://www.techpowerup.com/reviews/AMD/HD_7990/31.html


"When it launched, a generous eight-game bundle had me on the fence about the 7990’s prospects. But after spending time evaluating its thermals and acoustics (to say nothing about its crashes and performance hiccups in CrossFire, which could become a story unto itself), I can’t think of one reason to recommend 7990 to a friend. And, at the end of the day, that’s what this job is all about."
http://www.tomshardware.com/reviews/radeon-hd-7990-cros...
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August 4, 2014 4:27:17 AM

17seconds said:
You do realize that the 7990 was a terrible and fatally flawed card that was discontinued after only two months on the market, don't you? The list of problems includes: heat, noise, coil whine, and poor driver support.
http://www.tomshardware.com/reviews/radeon-hd-7990-cros...
http://www.techpowerup.com/reviews/AMD/HD_7990/31.html

Quotes:
"However, we've also seen many games that do not scale well, and they make up a significant portion of our tests. Out of eighteen titles, five did not scale, or worse, showed negative scaling. These are not small titles, but big AAA games: Assassin's Creed 3, Batman: Arkham City, F1 2012, StarCraft II, Skyrim, and World of Warcraft. What really surprises me is that this long list is the same as the one we had with our reviews of HD 7990 "New Zealand" implementations by board partners, like the ASUS ROG ARES II and PowerColor Devil 13. So either AMD does not care or can't fix CrossFire support with these games millions of people play."

"What is a major issue, though, is the extremely annoying coil whine the card emits as soon as it runs a 3D application. The whine is generated by resonating power circuitry coils and is a problem that can be resolved; it's just an engineering challenge. NVIDIA did so for the GTX 690 and GTX Titan; both cards don't have such coil whine issues. On the HD 7990, however, it is very apparent, and I don't understand how AMD missed such a glaring problem. I talked to five other reviewers and they all confirm it, so it's not an isolated issue. What makes the whine even more apparent is that it is constantly changing pitch and volume, drawing your attention to it by effectively overpowering the fans' "whoosh" sound."
http://www.techpowerup.com/reviews/AMD/HD_7990/31.html


"When it launched, a generous eight-game bundle had me on the fence about the 7990’s prospects. But after spending time evaluating its thermals and acoustics (to say nothing about its crashes and performance hiccups in CrossFire, which could become a story unto itself), I can’t think of one reason to recommend 7990 to a friend. And, at the end of the day, that’s what this job is all about."
http://www.tomshardware.com/reviews/radeon-hd-7990-cros...


Well I'm led to believe the R9 280X is a rebranded 7970 Ghz Edition Correct?

The Cheapest R9 280X I can find in the UK is £210 brand new. I bought a 7990, only a few months old for less than that...so....you know it doesn't really bother me one bit.

I just need to know what PSU I can use.

I incorrectly stated before the XFX 850W has 6 PCIE 6+2 pins, it actually has 4 6 pins and 2 6+2, so I still don't see how it can't support the 7990....

As for the coilwhine, Ah well I've live with it, and the 7990 is stronger than the GTX 690 (hexus' article showed they were evenly matched with the 7990 taking the edge). Plus the cheapest GTX 690 is £400 so....no thanks.

I dont' really see why you've slated the 7990 because you mentioned heat and noise as problems with it, however heat and noise are the same as the GTX 690.....
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August 4, 2014 4:31:48 AM

The XFX 850W will support the HD 7990, anyone who says otherwise should post links to prove their claim.
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August 4, 2014 5:31:29 AM

Eduello said:
The XFX 850W will support the HD 7990, anyone who says otherwise should post links to prove their claim.


Thank you, I was getting abit confused....
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