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post #21 of 26
I wouldnt bother with a 6990. The 6000 series isnt getting driver updates anymore, and isnt officially supported, especially in newer games. If price is an issue, you can get 270x GPUs with blower coolers for crossfire for $125 apiece.

that being said, a 850 watt PSU should be enough if you stick with two GPUs that pull the same or less power of a 6970.
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post #22 of 26
Thread Starter 
AMD released new Crimson drivers for 6xxx, and 5xxx cards last month. They're Betas, and no support but they exist.

I'll start shopping for 7970s. The R series BIOS video mode issue is a deal breaker for me I already own 2 R9-285s That I really like, but no BIOS screen is keeping me away from any more of them.

Usually the minute I mention Dell or BTX I hear crickets. But the 3 way CFX has gotten quite a reaction. Thanks for taking the time to reply. I think you guys are right about the 6990 not being worth the trouble.
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post #23 of 26
If you really like to tinker with hardware and OC, the 7870 Tahiti might be a GPU for you to play with. It is actually a 7950 but with slower clock. However, it can be overclocked to match it. The only main downside it it only has 2GB of VRAM. I think they are pretty cheap out there. $50 maybe?

http://www.legitreviews.com/powercolor-pcs-hd7870-myst-video-card-review-tahiti-le_2156

http://www.tweaktown.com/reviews/5158/sapphire_radeon_hd_7870_xt_tahiti_le_2gb_with_boost_overclocked_video_card_review/index.html
post #24 of 26
Quote:
Originally Posted by Retrorockit View Post

It's interesting that you say "It won't work" when Justajohn at Tomshardware is scoring 7500 in Firestrike with 2-HD7850s on a locked BIOS Dell BTX workstation. I already have the 6970s. But they might equal one of my R9-285s so I was looking for a way to kick it up a notch. I don't know how many times I've been told you can't overclock a Dell. But I'm doing it all the time. The prices I'm seeing on HD7990s are really scary!

Benchmarks are not games. If you plan to just bench, it wont be much problem. If you want consistent performance in games, not so much.

OH, R9 200 series cards other than 290 and 285 may work for you since they are all actually HD 7000 rebrands. I was using an R9 265 on a C2Q era Xeon system, worked fine. GTX 750 Ti though... not so much. I think an R9 290 even worked in that system with zero problems. The R9 285 is the most recent of the 200 series as far as launch date goes.
Edited by KarathKasun - 6/14/16 at 1:38pm
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post #25 of 26
Thread Starter 
The BIOS screen issue seems to be a Dell thing. I haven't seen it mentioned anywhere else. With an unlocked BIOS you could probably change the resolution. But Dell would rather sell you a new computer than fix your old one. Since some of the R series cards are just 7xxx I'll just avoid the issue by using those since I know they work. AMD support told me GCN cards don't support VESA 103. That's their story and I'm sticking to it!

I listened to you guys and shopped harder. I got an HD6990 for $119 on Ebay. So it's gonna happen! The reason I benchmark is since I'm the only one doing this people have questions such as "Does the DDR2-800 memory bottleneck the CPU?". The benchmarks provide the answers. BTW no it doesn't. We'll see how my 3 way 6970 stacks up against 2 way 7850s.
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post #26 of 26
Yeah. I may do something similar with my old Athlon II x4 640 @ 4ghz. Its on an older DDR2 board, just need to get 8gb of memory for it.

Ive got cards ranging from the HD 7850 to the R9 290 and GTX 465 to the GTX 960.

Could probably set up a benchmarking day after everything is built and pit it against my i5 and i7 rigs. I already know that it is significantly slower in newer titles like FO4 though. I did something similar with my dual C2Q Xeon box. In multi threaded stuff it was i7 powerful, but most games rely on a single heavy thread. In the end it came out %20-%50 slower in games.
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