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AMD Radeon HD 7990 specification leaked?

by Parm Mann on 20 March 2012, 13:34


Quick Link: HEXUS.net/qabd3v

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AMD seems to never tire of launching new graphics cards. We're still in the first quarter of 2012 and we've already enjoyed six new 7000-seres Radeons, but the red team's not going to stop there.

And perhaps with good reason. There's a chance NVIDIA will lay the smackdown on Radeon HD 7970 with the soon-to-be-unleashed GeForce GTX 680, but if that's the case, AMD already has its retaliation lined up in the form of the Radeon HD 7990.

The long-rumoured card will one day take its place atop the 7000-series food chain and, like the 6990 before it, will do so by employing two GPUs on a single PCB. This time around they'll be 28nm chips based on the GCN architecture and, according to Chinese website inpai.com.cn, each will feature the full complement of HD 7970 features.

That means a total of 4,096 processors (2,048 from each Tahiti XT core), 256 texture units, 64 ROPs and a massive 6GB of memory shared across GPUs via two 384-bit channels. So it's two 7970s in CrossFire on a single board? Not quite, as the leak intimates that each GPU will be clocked at 850MHz (down from 925MHz on the HD 7970) and the frame buffer will hit an effective 5,000MHz (down from 5,500MHz).

Either way, it'll be a monstrous card with a frightening price tag, and the same site suggests that the HD 7990 will launch as soon as April. Whether that's true or if this is just a bit of pre-Kepler noise remains to be seen, but here's a look at how the dual-GPU card could stack up to existing 7000-series range:

GPU Radeon HD 7990 (6,144MB) Radeon HD 7970
Radeon HD 7950
Radeon HD 7870
Radeon HD 7850
Codename New Zealand Tahiti XT Tahiti Pro Pitcairn XT Pitcairn Pro
DX API 11.1 11.1 11.1 11.1 11.1
Architecture GCN GCN GCN GCN GCN
Process 28nm 28nm 28nm 28nm 28nm
Transistors 4.3bn (x2) 4.3bn 4.3bn 2.8bn 2.8bn
Die Size 352mm² (x2) 352mm² 352mm² 212mm² 212mm²
Processors 4,096 2,048 1,792 1,280 1,024
Default memory 3GB (x2) 3GB 3GB 2GB 2GB
Compute units 64 32 28 20 16
Texture Units 256 128 112 80 64
ROP Units 64 32 32 32 32
GPU Clock (MHz) 850 925 800 1,000 860
Shader Clock (MHz) 850 925 800 1,000 860
GFLOPS 6,963 3,789 2,867 2,560 1,761
Memory Clock (MHz) 5,000 5,500 5,000 4,800 4,800
Memory Bus (bits) 384 (x2) 384 384 256 256
Max bandwidth (GB/s) 240 (x2) 264 240 153.6 153.6
Power Connectors Unknown 8+6 6+6 6+6 6-pin
TDP (watts) Unknown 250 200 175 130
CrossFire Support Unknown 4-way 4-way 2-way 2-way
Release MSRP Very expensive $549 $449 $349 $249

HEXUS Forums :: 7 Comments

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I like the price part :D
Yes, I lol'd at that, too :)
I guess they'll have to get this out before the 22nd~ if they want to keep their “Home of the world’s fastest Graphics Card for 853 days and counting” counter on their homepage?

Unless they think the 6990 is more powerful than the 680?
Unless they think the 6990 is more powerful than the 680?
Which it seems to be by various measures.
Which it seems to be by various measures.

It seems the HD6990 is still overall more powerful than a GTX680 looking at the leaked review results.