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XFX ATI Radeon HD 6790 vs asus hd 7770 in crossfire

Last response: in Graphics & Displays
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July 24, 2012 1:37:46 PM

hi guy i like to know if this gpu XFX ATI Radeon HD 6790 is better then what i got witch is asus radeon hd 7770 in dual crossfire, due to the 6790 its going cheap in ebay and the fact is im getting problems with fps in most of my games with my 2 x 7770

XFX ATI Radeon HD 6790 (ebay link)
http://www.ebay.co.uk/itm/280924300090?_trksid=p5197.c0...

asus radeon hd 7770 in crossfire mode
http://uk.asus.com/Graphics_Cards/AMD_Series/HD7770DC1G...

i really dont understand half of this and would like for some who about this to help me out
thanks for any help
simon
a b U Graphics card
July 24, 2012 1:44:25 PM

no it will be kind of a downgrade ?

Have you tried overclocking them ?
a b U Graphics card
July 24, 2012 2:09:04 PM

the hd 6790 should be better in 1080p > and high aa envoirnments
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July 24, 2012 2:26:32 PM

ok thanks but what if i crossfire the 6790 would that be better then the 7770 in croosfire because the 6790 got 265 bit where the 7770 is a 128 bit dose that make it better ??
a c 259 U Graphics card
a b Ĉ ASUS
July 24, 2012 2:51:44 PM

The 6790 is approximately the same power as a 7770. It is older, hotter technology so I see little value in going that route.

Some games do not support dual cards, or do so poorly.
Also, there is the issue of microstuttering, read about it here:
http://www.tomshardware.com/reviews/radeon-geforce-stut...

In particular, using lower powered dual cards tends to be more problematic.

My take is, to use a single stronger card whenever it will do the job.
a b U Graphics card
July 24, 2012 3:38:30 PM

Guys what are you talking about?The HD 6790 is slower than even one of his HD 7770's and it won't perform any better in high resolutions with AA because it has 16 ROPs which effectively makes it perform like a card with a 128 bit memory bus.

And even if he has problems with Crossfire he can awlays turn it off and use only one of the cards.This way the problems are gone and he still has a card faster than a HD 6790.

Also HD 6790 in Crossfire is SLOWER than HD 7770 in crossfire.It's slower when its a single card and also scales worse.

If you want an upgrade from the HD 7770 the absolute minumum you should consider is a HD 7850.Even that will be slower than your cards most of the time.
a b U Graphics card
July 24, 2012 3:52:11 PM

Sell those 2 7770's and get a 7850.
a c 143 U Graphics card
a b Ĉ ASUS
July 24, 2012 4:06:07 PM

Quote:
6790 CFX will be quite alot faster than 7770 CFX.

You came up with that alone? No one mentioned 6790s in CF.
a c 705 U Graphics card
a c 256 Ĉ ASUS
July 24, 2012 4:10:38 PM

Let's knock off the insults,I would rather not take further action.
a c 143 U Graphics card
a b Ĉ ASUS
July 24, 2012 4:16:30 PM

Quote:
Here to cause epic arguments ilysaml...
I shall not feed the troll.

You weren't precise at your comment and this might confuse the others like me.
And for the insult, Area51 replied to you.
a c 705 U Graphics card
a c 256 Ĉ ASUS
July 24, 2012 4:19:07 PM

Let's help the OP or i feel a ban coming.
August 24, 2012 8:56:18 PM

Right, there's a lot of back and forth and the crux of the post is actually more confusing than it should be. The following info was taken directly off of AMD's website:

Radeon HD 6790
800 stream processors
16 rops
1 gb gddr5 @ 256bit
840 MHz core clock
1050 MHz memory clock

Radeon HD 7770 GHz Edition
640 stream processors
16 rops
2 GB GDDR5 @ 128 bit
1000 MHz core clock
1125 MHz memory clock

Looking at just the numbers you'd think the 6790 would be the better card. However, the 6790 uses the Barts LE architecture, which is modified for better tessellation and geometry performance in AA, and the 7770 uses the new GCN architecture. This new architecure is far more capable within DirectX 11 and uses less power. As a result, the 7770 actually out performs the Radeon HD 6850 in most games using DX11 despite only having 128 bit memory bus, 320 less SPU's, and half the ROP's of the 6850. It's performance within DX9 is significantly lagging, even the Radeon HD 5770 beats it according to the testing done here at Tom's.

So then, no, the 6790 would not be an upgrade path, unless your gaming in DX9.
Two 7770 in crossfire managed similar performance as a single 7870 according to the tests done by www.techpowerup.com, averaging 22 and 22.4 fps respectively in Metro 2033 at 1900x1200, so if your using DX11, then I'd suggest getting a pair of 7870's for $260 each if you're looking for significantly better performance, or a pair of 7850's for $210 each if you want a moderate performance increase.
I think your best option, however, is a single 7950 for $320. It will offer better performance than the 2 7770's you have now, and you can get another 7950 card in 6 months or so when prices drop.
!