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Windows 7: 6870+6770 vs 6990

29 Jul 2011   #1

Windows 7 Ultimate
6870+6770 vs 6990

So for the next little while, I'll be running a 6870 and a 6770 in crossfire, and I'm kinda curious how the two will stack up against the flagship 6990. I will also have the chance to run two 6870's in crossfire as well, and see what power they produce. Any ideas how these combos will stack up and perform? Should I notice a difference from a single 6870?

My System SpecsSystem Spec

29 Jul 2011   #2
Microsoft MVP

Win 7 Ultimate x64

I'll be running a 6870 and a 6770 in crossfire
Not according to this you won't,

6870+6770 vs 6990-crossfire.png

Not only that but the 6870 is a newer GPU, where the 6770 is still the older 5770 just with a couple of new features added to it.

My System SpecsSystem Spec
29 Jul 2011   #3

Windows 7 Ultimate

I'm going to save that picture, as it'll probably come in handy down the road. I'm well aware of what the 6770 is, however, I didn't know it wouldn't play nice with my 6870. I still have to toss it in to bench mark it though, so either way, I get to downgrade for a bit. Thanks for that, +1 for the useful info
My System SpecsSystem Spec

29 Jul 2011   #4

Windows 8.1 - 64 Bit

I read in review 6990 requires 750watts to run on its own
My System SpecsSystem Spec
29 Jul 2011   #5

Windows 7 Pro X64 SP1

Quote   Quote: Originally Posted by Devilz View Post
I read in review 6990 requires 750watts to run on its own
That's a system power supply spec.

The card itself dissipates less than 375W. (It requires two 8 pin PCI-E power connectors, 150W each.) That's a lot.
My System SpecsSystem Spec
29 Jul 2011   #6

Windows 7 Ultimate

Twin 6990's would draw 750w... but why would you ever need that much power?
My System SpecsSystem Spec
30 Jul 2011   #7

64-Bit W7 Ult_sp1

more power..!!

wow, bet two of those 6990's would scream..!!
My System SpecsSystem Spec
31 Jul 2011   #8

Windows 8.1 - 64 Bit

I'm fine with 5770's in crossfire mode, they will do me for couple of months
My System SpecsSystem Spec
08 Aug 2011   #9

Windows 7 Ultimate

Ah. Update. 6870 and 6770 play nice in crossfire. Had them both up and running, no real difference in benchmarking though. Girlfriend is happy with it though
My System SpecsSystem Spec
03 Jun 2013   #10

Windows 8 64 Bit
How did the config run after the update?

How did your 6870+6770 crossfire perform? Was your 6770 the model with 1GB DDR3? And 6870 w 1 GB DDR5 I assume?

You are the only literature on this so please let me know. Before the trolls come of course we know it is not an ideal config and that the lower bit rate of the 6770 may hinder performance. Is it possible to run the 6870 as the GPU and slave the 6770 to run strictly physics rendering? I need more general stability and would be thrilled with 10 more FPS. I know many cards can provide this with no problem but I am trying to work with these two until I find exactly what I want.

If the different memory types ddr3 v ddr5 hinder the config impossible, I would love a technical answer as to why if anyone could explain.

Please let me know what you know! I will greatly appreciate it.

**Information is the most valuable resource.**
My System SpecsSystem Spec

 6870+6770 vs 6990

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