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6790 or 6850? - Page 5

post #41 of 43
Quote:
Originally Posted by Jagged_Steel;15509051 
In single card situations this is mostly true, but the 6790 scales better when Crossfired, negating the 15% better performance the 6850 has over the 6790. If you intend to Crossfire, 2x6790 @ $200 will perform the same as 2x6850 @ $300. If you plan on dropping ~$300 I would go for single 6970. If you are going to spend $200 my choice would be a single 6870, OR even better 2x6790s Crossfired. This is definitely the best bang for the buck in the <$200 GPU range right now, especially if you have a smokin hot mobo like the OPs.wink.gif

No. Just no.

radeonhd6000series.png

As you can see, Because of half the ROP's, you end up with half the pixel fillrate per clock. Quite a shame really. The lame ROP's and pixel fillrate is why they put this card in with the 6700 series. And when you compare it to those cards, it is poor performance per price compared to the HD 6750 and HD 6770 which have much more headroom.

HD 6850's and HD 6950's are truely the sweetspot for overclockers who want best price/performance. HD 6870 is one of the poorest choices for overclockers as it has such low headroom. An HD 6850 catches up to it, yet it can't catch up to the HD 6950.

Quote:
Originally Posted by Redwoodz;15508521 
after doing some further research on HWBOT, I can verify the crossfire performance between the 6790 and 6850, they score very, very closely. Furthermore, the 6790 seems to have a slight edge in overclocking.

This is total nonsense. I guarantee that there is no Crossfire HD 6790's that come anywhere close to my CF 6850's in the HWBOT database. If anything, the HD 6850 should scale better due to twice the output render processors. You can look at my HWBOT scores by clicking the icon near my +rep tab. All recent VLIW5 Radeons typically top out at about 1GHZ, however because HD 6790's are budget cards, they typically have cheaper components on the PCB, such as VRMs, and this can very much limit overclocking.
Edited by damric - 10/30/11 at 3:42pm
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post #42 of 43
Quote:
Originally Posted by damric;15512046 
however because HD 6790's are budget cards, they typically have cheaper components on the PCB, such as VRMs, and this can very much limit overclocking.[/COLOR]

wrong... 905/1200 with more room to go if i choose to is not a very limited oc. most of the 6790's oc very well. look at all the reviews, and even some of us on ocn. they will oc great, and if i was to vmod it i am sure it would even more.

as for cheap parts it is based on the 6850 pcb, but the ROP's are laser cut. has good grade caps and vrm's. so i dont get how you think they are limited. perhaps you should go by real life performance instead of a synthetic bench that truly is just a bench, something to base stuff on but not of actual performance.
post #43 of 43
Quote:
Originally Posted by The Fryer;15513037 
wrong... 905/1200 with more room to go if i choose to is not a very limited oc. most of the 6790's oc very well. look at all the reviews, and even some of us on ocn. they will oc great, and if i was to vmod it i am sure it would even more.

as for cheap parts it is based on the 6850 pcb, but the ROP's are laser cut. has good grade caps and vrm's. so i dont get how you think they are limited. perhaps you should go by real life performance instead of a synthetic bench that truly is just a bench, something to base stuff on but not of actual performance.

905 core is a mere 10% OC (actually that's embarrassing), shying in comparison to the 30% OC of my HD 6850 @ 1000 core.

The spreadsheet I showed you is no synthetic benchmark. It is direct data from GPU-Z. You can also calculate pixel fillrate yourself by multiplying Core Clock by #ROPs.

I know this is heartbreaking information for those of you that actually bought the HD 6790, thinking it was going to be close to the same as the other Barts. Unfortunately it really does have more in common with the old Juniper when it comes to core configuration and output.

I am not sure why you are trying to misinform the OP with your obviously limited GPU knowledge, but it is a great dis-service to him as he is trying to get the most GPU for his wallet.

If not at least getting the HD 6850 or HD 6950, he might as well drop down to HD 6770 (5770) or even HD 5750 (5750) as they offer much more value than the HD 6790 clock per clock, or even the GTX 460 SE which were on sale on the egg not long ago for $110, or even a used HD 4890 for $80. See below:

noobsy.png

My old HD 5750 @over 37% OC devil.gif

3dmark11k.png
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