The HD7790 "Bonaire" New GPU from AMD [Edit: NOW WITH 100% MORE REVIEWS!]

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Tuna-Fish

Golden Member
Mar 4, 2011
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Fanatical Meat said:
Could someone please explain how its possible that this card could be faster at Crysis/BF3 than a 7850 that overall seems to be more of everything?
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Stock 7850 has really low clocks. This could easily have very similar or even higher shading power if it clocks high enough.

Also, it's supposed to have new and improved command processors, which should help increase efficiency in a lot of situations.
 
NTMBK

NTMBK

Lifer
Nov 14, 2011
10,448
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VulgarDisplay said:
Could this be the discrete GPU version of the PS4 and Xbox Next GPU's? I never saw how many stream processors they were supposed to have?
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I don't see why it would have more in common with a GCN APU than with existing GCN dGPUs?
 
Olikan

Olikan

Platinum Member
Sep 23, 2011
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more info...
A presentation slide, allegedly by AMD, leaked by a Japanese distributor confirmed specifications of AMD's upcoming Radeon HD 7790 graphics card. According to the slide, the HD 7790 is indeed based on a brand new silicon, with a transistor count of 2.08 billion. Compare that, to the 1.5 billion TC of "Cape Verde," and 2.80 billion of "Pitcairn." The silicon is built on the 28 nanometer silicon fab process.

The clock speed mentioned in the slide could be core, which is clocked at 1.00 GHz. Next up is the stream processor count, which stands at 896. The HD 7790 is mentioned to feature a primitive rate of 2 prim/clk, suggesting that its component hierarchy is more similar to "Tahiti" than "Cape Verde," which could mean double the tessellation processing power. All said and done, the HD 7790 belts out 1.79 TFLOPs of floating-point performance. The source goes on to mention in its text that the card features a 128-bit wide memory interface, memory clock speed of 6.00 GHz (96 GB/s), a TDP of 85W, and a single 6-pin PCIe power connector. It is expected to launch no later than tomorrow (22/03).
Click to expand...
it should end beeing faster than a 7770 (by almost 40%) and using less power (100w vs 85w)...

btw....it looks similar to PS4 performance...in terms of Gflops, it seems beat a 7850 Oo

http://www.techpowerup.com/181740/A...al-Specifications-Release-Date-Confirmed.html

3a_thm.jpg
 
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Arkadrel

Diamond Member
Oct 19, 2010
3,681
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Silverforce11 said:
Its going to be so bandwidth starved, all that processing power on 128bit bus... so meh.
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Silverforce11 has a good point.

Gflops:
7790 = 1.79 Gflops ( 85watts TPDmax) (~60% less power used)
7850 = 1.76 Gflops (130watts TPDmax)

Memory bandwidth:
7790 = 96,0 GB/s
7850 = 153,6 GB/s (~60% more memory bandwidth)


I think this card is gonna be great for people that run lower resolutions.
Probably end up performing like the 7850 or beating it in a few cases.


The HD 7790 is mentioned to feature a primitive rate of 2 prim/clk, suggesting that its component hierarchy is more similar to "Tahiti" than "Cape Verde," which could mean double the tessellation processing power.
Click to expand...


I think this little card is gonna be great, and I hope its not too limited by memory bandwidth.
 
Olikan

Olikan

Platinum Member
Sep 23, 2011
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Silverforce11 said:
Its going to be so bandwidth starved, all that processing power on 128bit bus... so meh.
Click to expand...

yeah... the bandwidth is a killer, even at OC it stood behind a stock 7850...

but it will be a great card for bitcoin miners :p
 
Imouto

Imouto

Golden Member
Jul 6, 2011
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Dat TDP!

85W TDP by AMD standards delivering almost the same gaming power than the HD 7850 which has 130W TDP is a huge accomplishment.
 
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Arkadrel

Diamond Member
Oct 19, 2010
3,681
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Imouto said:
Dat TDP!

85W TDP by AMD standards delivering almost the same gaming power than the HD 7850 which has 130W TDP is a huge accomplishment.
Click to expand...

If true, it may signal the next gen high end with GCN 2.0 being much more efficient.
Click to expand...
Im not sure if this is full GCN 2.0, but its probably like a half & half.
Maybe GCN 1.5 or something.

Eitherway it does appear like its more efficient.
Which sounds good for when the next gen series of cards come out.

The fact that tessellation ability might go up x2 is pretty big too.


**edit: Part of why it uses less power than the 7850, is the 256bit bus vs 128bit bus.

So its kinda oranges and apples.
But compaired to a 7770, that is also 128bit you probably get a better idea in terms of efficincy.

7770 = 16,00 Gflops / watts
7790 = 21,08 Gflops / watts (~31,8% improvment over the 7770)
 
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Arkadrel

Diamond Member
Oct 19, 2010
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Olikan

Olikan

Platinum Member
Sep 23, 2011
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Arkadrel said:
Im not sure if this is full GCN 2.0, but its probably like a half & half.
Maybe GCN 1.5 or something.

Eitherway it does appear like its more efficient.
Which sounds good for when the next gen series of cards come out.

The fact that tessellation ability might go up x2 is pretty big too.
Click to expand...

GCN 2.0...should be named GCN 1.1, the changes are very small :p

but yeah, i do have my doubts too
 
S

skipsneeky2

Diamond Member
May 21, 2011
5,035
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Imouto said:
Dat TDP!

85W TDP by AMD standards delivering almost the same gaming power than the HD 7850 which has 130W TDP is a huge accomplishment.
Click to expand...

Making me wanna perhaps sell off my 7850 and switch to a 7790 as i will be hooking up my 720p t.v as my tower has sorta become a htpc,low noise and heat and those tdp numbers make for a interesting card.
 
A

Arkadrel

Diamond Member
Oct 19, 2010
3,681
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GCN 2.0...should be named GCN 1.1, the changes are very small :p
Click to expand...

Still.....

________________ 7770 Vs 7790:
Steam processors:__ 640 vs 768 (+20%)
GPU frequency:____1000 vs 1075 (~1.1%)

Performance differnce? ~40%

Its a improvement, when you have 20% more "gpu" in steam processors,
but you have more than a 40% increase in performance.
 
Plimogz

Plimogz

Senior member
Oct 3, 2009
678
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Arkadrel said:
Still.....

________________ 7770 Vs 7790:
Steam processors:__ 640 vs 768 (+20%)
GPU frequency:____1000 vs 1075 (~1.1%)

Performance differnce? ~40%

Its a improvement, when you have 20% more "gpu" in steam processors,
but you have more than a 40% increase in performance.
Click to expand...

40% more performance from 20% more Stream Procs. would be nice. Unfortunately, the TPU preview from the OP says 896 (which is exactly 40% more) and the Tom's hardware link says 728 (which sounds like a typo, but still).

And Olikan's link sets up the comparison between a 7770, a 7790 and a 650ti, but then the labels on all benchmark results have a Cape Verde pro 7750 rather than the 7770 Cape Verde XT.

In all, I'm waiting for the real reviews -- which according to Fudzilla are going to show up tomorrow, the 22nd. (also according to Fud, Bonaire has 768 processors).
 
MrK6

MrK6

Diamond Member
Aug 9, 2004
4,458
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Decent performance that will fill the gap between the 7770 and 7850 (which was quite large, tbh). Hopefully they eventually price it in the $120-130 range to make it viable.
 
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