Tuesday, October 19th 2010

AMD Radeon HD 6800 Series Specifications Leaked

Specifications of the upcoming Radeon HD 6800 series GPUs have already been doing rounds for the last couple of days, and ChipHell.com finally managed to leak an alleged press-deck of the HD 6800 series that discloses the GPUs' specifications and some key features that AMD will introduce with this generation. What can be said looking at the slides is that AMD seems to have stepped up performance/die-size big time (up to 35% increase in performance per mm²), with some reconfiguring of key components. It also redesigned the GPUs to have up to 100% increase in tessellation performance, new image-quality enhancements, a new video acceleration engine (UVD 3), and a redesigned display IO with 2nd Gen. Eyefinity technology that can let users of standard variants drive up to six displays with a single card.

Specifications of the HD 6870 are: 1120 stream processors, 32 ROPs, 56 TMUs, 256-bit GDDR5 memory interface holding 1 GB, clock speeds of 900/1050(4200) MHz core/memory(effective), and idle/max board power of 19W/151W. For the HD 6850, it's 960 stream processors, 32 ROPs, 48 TMUs, 256-bit GDDR5 memory interface holding 1 GB, clock speeds of 775/1000(4000) MHz, idle/max board power of 19W/127W.

Source: ChipHell
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107 Comments on AMD Radeon HD 6800 Series Specifications Leaked

#1
HTC
by: btarunr
Specifications of the upcoming Radeon HD 6800 series GPUs have already been doing rounds for the last couple of days, and ChipHell.com finally managed to leak an alleged press-deck of the HD 6800 series that discloses the GPUs' specifications and some key features that AMD will introduce with this generation. What can be said looking at the slides is that AMD seems to have stepped up performance/die-size big time (up to 35% increase in performance per mm²), with some reconfiguring of key components. It also redesigned the GPUs to have up to 100% increase in tessellation performance, new image-quality enhancements, a new video acceleration engine (UVD 3), and a redesigned display IO with 2nd Gen. Eyefinity technology that can let users of standard variants drive up to six displays with a single card.

Specifications of the HD 6870 are: 1120 stream processors, 32 ROPs, 56 TMUs, 256-bit GDDR5 memory interface holding 1 GB, clock speeds of 900/1050(4200) MHz core/memory(effective), and idle/max board power of 19W/151W. For the HD 6850, it's 960 stream processors, 32 ROPs, 48 TMUs, 256-bit GDDR5 memory interface holding 1 GB, clock speeds of 775/1000(4000) MHz, idle/max board power of 19W/127W.
19W idle? DAMN!!!!!
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#2
wolf
Performance Enthusiast
swish specs! better performance than 5850 is said, which is promising, but I had hoped for closer to 5870 performance with the 6870, maybe driver updates will brige that gap, and hec, I ain't seen a review yet.

maybe some crossfire improvements too?
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#3
afw
Ok ... this is really irritating ... I just wanna see some benchmarks ... :(
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#4
vinhak49
good job AMD

It's still specs, let see how far it improve over HD5870 and HD5850. :):toast:
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#5
cadaveca
My name is Dave
I think these are still 5-D, and they added extra shaders to existing Juniper designs because of extra pad space required to shift to 256-bit mem. I expect a small increase from 4890 performance..20%(800 + 160 extra shaders=+20%, plus some extra becuase of faster mem bus). New dispatch processor, and tesselation thrown in, we might see a big impact with just those changed, and no shader change.

I do not see 5870/5850 being obsoleted...the whole renaming and such will keep 5850/5870 value up.
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#6
KainXS
probably but I wonder how much tessellation performance they have now
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#7
cadaveca
My name is Dave
by: KainXS
probably but I wonder how much tessellation performance they have now
Double the previous gen. NOt sure if it;s two full "old units", or a completely new design though.
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#9
cadaveca
My name is Dave
Thanks, that basically confirms still 5-D, and now there is two set-up/tesselation engines.


Slide says 12-14 SIMD engines, which MUST be 5-D(960/12=???:laugh:), shows seperate tesselator, etc...confirms 100% increase...ugh...this is exactly what i expected.
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#10
a_ump
maybe. Why is it that you think they're still 5-D? it's been well explained and strongly rumor'd as being in 4-D. I'm pretty sure that's actually a fact.
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#11
buggalugs
by: vinhak49
It's still specs, let see how far it improve over HD5870 and HD5850. :):toast:
Its not a replacement for the 5870/5850. The 6850/6870 are about the same as 5850/5870 except with double the tessellation performance.

The 6850/6870 are to replace the 5770 performance bracket and to take on the Nvidia 460...which it does.
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#13
cadaveca
My name is Dave
by: a_ump
maybe. Why is it that you think they're still 5-D? it's been well explained and strongly rumor'd as being in 4-D. I'm pretty sure that's actually a fact.
They could not be the rumoured 4-D, add the new features shown in those slides, plus increase bus width, and keep power within those confines(<150w for 6850/5850).

What they have done to get the increase in performance is two set-up engines, seperating the die into two, and making like a real dual-core gpu, with each side of the dualcore having thier own tesselation engine. This way they can literally double the gpu usage(needed, based on my own experience with cypress, and poor Crossfire scaling exposing less than 60% gpu usage per card)

See, I know that they have issues keeping shaders filled, and that would perfectly fix that, and also explains the higher geometry throughput.

This is just a simple refresh.

If it WAS 4-D, then 800 shaders should basically double the performance of the previous gen, but this is not the case(ie, 6870 would be faster than 5870). I mean, I may be wrong, but I highly doubt they could also do this as stay pin-compatible with cypress...it would require a different power layout for the socket, IMHO. 4D would also require the set-up engine change, but I do not think we'd have SIMDs with 80 units any more.
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#14
HalfAHertz
by: cadaveca
I think these are still 5-D, and they added extra shaders to existing Juniper designs because of extra pad space required to shift to 256-bit mem. I expect a small increase from 4890 performance..20%(800 + 160 extra shaders=+20%, plus some extra becuase of faster mem bus). New dispatch processor, and tesselation thrown in, we might see a big impact with just those changed, and no shader change.

I do not see 5870/5850 being obsoleted...the whole renaming and such will keep 5850/5870 value up.
I think you are wrong :)
Look at the slides. On the fourth they have shown a legend map of the die and you can see the 14 SIMDs. Each of them consists of 5 Texture units and if you look carefully, you can see that you have 4 texture cores in each TU, which hold the SPs. So if we say that the SPs are marked with "x", then x*4*5*14=1120 and that means that x = 4

Edit: I am guessing the 6850 has two SIMDS disabled, which would look like 4SPs*4TCs*5TU*12SIMDS=960SPs
Posted on Reply
#15
mechtech
by: vinhak49
It's still specs, let see how far it improve over HD5870 and HD5850. :):toast:
Some area's it may not improve over 5870 as it has 1600 shaders!!
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#16
buggalugs
Haha you guys stop posting them i already did it!! lol
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#17
ebolamonkey3
by: HTC
19W idle? DAMN!!!!!
What's the idle power usage on the 5850 and 5870?
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#18
cadaveca
My name is Dave
by: HalfAHertz
I think you are wrong :)
Look at the slides. On the fourth they have shown a legend map of the die and you can see the 14 SIMDs. Each of them consists of 5 Texture units and if you look carefully, you can see that you have 4 texture cores in each TU, which hold the SPs. So if we say that the SPs are marked with "x", then x*4*5*14=1120 and that means that x = 4

Edit: I am guessing the 6850 has two SIMDS disabled, which would look like 4SPs*4TCs*5TU*12SIMDS=960SPs
I see, in the red vertical boxes (a single SIMD), 16 smaller boxes. Each of those 16 boxes holds the actual shaders. Now ,to me 16x4=? 64? 12x64=not enough.

I've blown up that pic you refer to as large as possible, and do not see anything to indicate what you are saying. Keep in mind, my 30-inch does a good job of displaying enlarged images.


Time will tell though...a short wait is all that is left.

Funny, now, many said the cards were going to launch today, and I said no(I actually said I doubt it possible because of constraints within memory production). Look...no real launch today...just some pictures...
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#19
HTC
by: ebolamonkey3
What's the idle power usage on the 5850 and 5870?
It's 18W for the reference 5850.

Strangely enough, i thought it was more ... Must have confuse it with some other card, i guess.
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#20
afw
So 6870 is around 20% faster than a 1GB GTX460 and the 6850 is around 25% faster than a 768MB GTX 460 (according to the graphs) .... hmmm .... but IMHO I dont think these will be competitive @ $249 and $199 ... cos currently the GTX 460s are selling for $220 and $170 (1GB/768MB) ... Hope they'll release it at a lesser price ...
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#21
btarunr
Editor & Senior Moderator
by: ebolamonkey3
what's the idle power usage on the 5850 and 5870?
25w/27w.
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#22
cadaveca
My name is Dave
by: btarunr
25w/27w.
Only when clocks reduced down to 157/300, which isn't the case in most configs now, thanks to the dual-monitor flicker problem. My main card idles @ 400/900, evne with only one installed, but the slave will drop down to 157/300.

And there's the source of my cursor corruption too.
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#23
btarunr
Editor & Senior Moderator
by: cadaveca
Only when clocks reduced down to 157/300, which isn't the case in most configs now, thanks to the dual-monitor flicker problem.
Idle wattage obviously is measured on the GPU's default 2D clock profile, both by AMD and NVIDIA.
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#24
buggalugs
by: cadaveca
Only when clocks reduced down to 157/300, which isn't the case in most configs now, thanks to the dual-monitor flicker problem.
Well, to be fair most users (95%?) still only have 1 screen. I dont know if anyone has figures but i suspect eyefinity users is a tiny number overall.
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#25
cadaveca
My name is Dave
by: btarunr
Idle wattage obviously is measured on the GPU's default 2D clock profile, both by AMD and NVIDIA.
I know...but the default...it's not the same as it was at launch, now. I've seen an increase of a bit over 10c at idle thanks to the clock increase.

Buggalugs, I have been running one monitor for some time now, as i RMA'ed one card a bit over two weeks ago. My idle clocks are 400/900. UVD clocks are 600/1250, and full speed is 900/1250.
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