Thursday, January 5th 2012

AMD Denies Hidden GCN CUs in Tahiti

Over the past few days, we were hearing rumors from many quarters that AMD's "Tahiti" high-performance GPU may have been a deviation from an older specification, and that it really has 2304 stream processors spread across 40 GCN compute units (CUs), instead of the 32 the Radeon HD 7970 ended up with. Both AMD and NVIDIA create more redundant components on their chips than their SKUs end up getting, so they could increase yields, it's a process commonly known as "harvesting".

On Tuesday, AMD quashed the rumor in an e-mail to Bright Side of News, in which it said that Tahiti XT (Radeon HD 7970) makes use of all the CUs there are, on the chip. The 40 CU / 2308 SP rumor gained some weight with the fact that since AMD is venturing into unknown territory (TSMC's 28 nm process, built after quite some delays and failures), it could do some heavy harvesting. Examples of harvesting in recent past include Intel Sandy Bridge-E Core i7 processors, which use only up to 6 out of 8 cores on the silicon, and only up to 15 MB out of 20 MB available on it; and GeForce GTX 480, which used only 480 out of 512 CUDA cores available on the GF100 GPU.

Source: Bright Side of News
Add your own comment

52 Comments on AMD Denies Hidden GCN CUs in Tahiti

#1
ERazer
PremoGS said:
Did you get this card over a year ago? I got my GTX580 over a year ago. If they had made this card a year ago, it would have been something, but now, the card is worthless.
Took the shitty company over a year to beat the GTX580 which was based on Fermi which again, is over 2 years older, what can I say? AMD = :lmao:
how is it worthless? maybe to you bud since this card is sidegrade, dont be hatin cuz you spent way more for same results
Posted on Reply
#2
fullinfusion
Vanguard Beta Tester
^ lol point well spoken :toast:
Posted on Reply
#3
Horrux
PremoGS said:
Did you get this card over a year ago? I got my GTX580 over a year ago. If they had made this card a year ago, it would have been something, but now, the card is worthless.
Took the shitty company over a year to beat the GTX580 which was based on Fermi which again, is over 2 years older, what can I say? AMD = :lmao:
Wow, extreme, frothing-at-the-mouth, fanboism? Nice! :D

Uh, by the way, which company has the most powerful graphics card for the last 3 years or so?

That AMD didn't have a single-GPU card that competed directly with the GTX 580 doesn't mean squat if they still put out the fastest single graphics card. In your opinion, nVidia is better because of that single little detail. Guess what. The vast majority of users don't care. The vast majority of users won't spend $550 on a card. And there are AMD cards priced similarly to the GTX 580 that are very competitive, such as the 6870x2. Oh wait, for the same money that card outperforms the GTX 580. Except it has 2 GPUs.

So in your opinion, that makes nVidia a maker of vastly superior hardware? You are smoking some very funny stuff dude.


ERazer said:
how is it worthless? maybe to you bud since this card is sidegrade, dont be hatin cuz you spent way more for same results
What do you mean, a sidegrade. The 7970 is quite a bit faster than a 580.
Posted on Reply
#4
ERazer
Horrux said:

What do you mean, a sidegrade. The 7970 is quite a bit faster than a 580.
http://tpucdn.com/reviews/AMD/HD_7970/images/perfrel.gif

tell me is 8% "worth" the upgrade for me? thats what i mean side grade :rolleyes:

dont fanboy crap on me, im on my side which is best bang for my money and currently not worth upgrading
Posted on Reply
#5
Damn_Smooth
PremoGS said:
Did you get this card over a year ago? I got my GTX580 over a year ago. If they had made this card a year ago, it would have been something, but now, the card is worthless.
Took the shitty company over a year to beat the GTX580 which was based on Fermi which again, is over 2 years older, what can I say? AMD = :lmao:
Sounds like someone is seriously butthurt because his card is in a way distant 2nd place and Nvidia won't have anything to compete for god knows how long.

It's OK little feller, it happens.
Posted on Reply
#6
brandonwh64
Addicted to Bacon and StarCrunches!!!
Damn_Smooth said:
Sounds like someone is seriously butthurt because his card is in a way distant 2nd place and Nvidia won't have anything to compete for god knows how long.

It's OK little feller, it happens.
Premo is pissed cause his old 4850 caught a bad driver and he wants to suicide bomb AMD headquarters! He's nothing more than a fanboi troll..
Posted on Reply
#7
Damn_Smooth
brandonwh64 said:
Premo is pissed cause his old 4850 caught a bad driver and he wants to suicide bomb AMD headquarters! He's nothing more than a fanboi troll..
You mean he doesn't realize that people catch bad drivers on both sides of the fence? It's shitty, but it happens.
Posted on Reply
#8
brandonwh64
Addicted to Bacon and StarCrunches!!!
Damn_Smooth said:
You mean he doesn't realize that people catch bad drivers on both sides of the fence? It's shitty, but it happens.
That as well. Both makers have their issues but he says AMD IS THE DEVIL!
Posted on Reply
#9
ERazer
dunno whats big deal anyway, its good competition and better prices for all of us
Posted on Reply
#10
Horrux
ERazer said:
http://tpucdn.com/reviews/AMD/HD_7970/images/perfrel.gif

tell me is 8% "worth" the upgrade for me? thats what i mean side grade :rolleyes:

dont fanboy crap on me, im on my side which is best bang for my money and currently not worth upgrading
Do you play at "ALL RESOLUTIONS"?

You should know the lower resolutions are all CPU bound, even moreso with these monster graphics cards.

Let's take some slightly more reasonable examples, and PLEASE keep in mind these were done with beta drivers with lots of kinks left in them, which explains why the "summary" scores are lower than they should be. Yes, I am accusing you of intentionally misleading with your post. Oh and it looks like you can't read either, given that my fanboi comment was clearly as a reply to that PremoGS person.

BF3 1080p, 20% faster:


BF3 2560x1600, 23.7% faster:


Summary, 1080p, 11% faster:


Summary 2560x1600, 19% faster:


So yeah, I think 20% faster (on beta drivers) is an upgrade, not a sidegrade. Is it one *I* would personally make from a gtx 580? That's another question entirely, but certainly to call the 7970 an equal to the 580 is misleading at best.
Posted on Reply
#11
D4S4
wtf are you all on about?!?!?!? if it really does have disabled units that's fucking awesome. potential unlockability, potential for amd to release an even more powerful card using the same chip.

having said that, i doubt there really are disabled units and on the car analogy, this would be as if they said there's a 2.5 turbo under the hood when there really is a naturally aspirated 3.5.
Posted on Reply
#12
digibucc
you all? did you read the thread? there was ONE person, and EVERYONE else corrected them.
Posted on Reply
#13
ERazer
Horrux said:
Do you play at "ALL RESOLUTIONS"?

You should know the lower resolutions are all CPU bound, even moreso with these monster graphics cards.

Let's take some slightly more reasonable examples, and PLEASE keep in mind these were done with beta drivers with lots of kinks left in them, which explains why the "summary" scores are lower than they should be. Yes, I am accusing you of intentionally misleading with your post. Oh and it looks like you can't read either, given that my fanboi comment was clearly as a reply to that PremoGS person.

BF3 1080p, 20% faster:
http://tpucdn.com/reviews/AMD/HD_7970/images/bf3_1920_1200.gif

BF3 2560x1600, 23.7% faster:
http://tpucdn.com/reviews/AMD/HD_7970/images/bf3_2560_1600.gif

Summary, 1080p, 11% faster:
http://tpucdn.com/reviews/AMD/HD_7970/images/perfrel_1920.gif

BF3 2560x1600, 19% faster:
http://tpucdn.com/reviews/AMD/HD_7970/images/perfrel_2560.gif

So yeah, I think 20% faster (on beta drivers) is an upgrade, not a sidegrade. Is it one *I* would personally make from a gtx 580? That's another question entirely, but certainly to call the 7970 an equal to the 580 is misleading at best.
i play on 1080p and 10% "imo" is not improvement when i had my 580 for a year now

not trying to mislead ppl clearly numbers showed 7970 is better, and i definitely recommend it for ppl trying to choose b/n 580 and 7970 but for those who have 580? no bc i would wait what green team has to offer

and my fanboy comment is meant for anybody trying to start pointless argument which team is better
Posted on Reply
#14
D4S4
digibucc said:
you all? did you read the thread? there was ONE person, and EVERYONE else corrected them.
sorry, my reading comprehension might be a little off today... i just flew over the first page.
Posted on Reply
#15
Horrux
ERazer said:
i play on 1080p and 10% "imo" is not improvement when i had my 580 for a year now

not trying to mislead ppl clearly numbers showed 7970 is better, and i definitely recommend it for ppl trying to choose b/n 580 and 7970 but for those who have 580? no bc i would wait what green team has to offer

and my fanboy comment is meant for anybody trying to start pointless argument which team is better
You are including all the games for which the driver support is broken, due to being in beta state, in the 11% assessment of overall performance. In other words you are either misleading or misled. Those are not final performance numbers, they are only pre-release numbers. You should try and understand that.
Posted on Reply
#16
happita
D4S4 said:
wtf are you all on about?!?!?!? if it really does have disabled units that's fucking awesome. potential unlockability, potential for amd to release an even more powerful card using the same chip.
I doubt it though, since it's a new architecture that they have very little experience in. Unless it was a slip up and they just left it as it was. Doesn't matter to me though, I'm more looking forward to the 7950 when that comes out, should be a great upgrade from my 5850 :cool:
I'm only interested in OC'ing these things like a boss. Going to wait for some non-reference variants that have factory OC and some quiet coolers :D
Posted on Reply
#17
v12dock
Will there be all this hating when Kepler is 10% faster.

Fact the 7970 overclocks like a boss so will kepler?
Will you be satisfied when W1zzard reviews a sapphire card @ 1335Mhz and is 30% faster
Your epeen is no longer the biggest just accept
Posted on Reply
#18
pr0n Inspector
ugh, GPU thread cat fight, move along, nothing to see here.
Posted on Reply
#20
THE_EGG
1Kurgan1 said:
And here comes the trolls, you must be bad at reading, NV did this with their 480's... Move along :laugh: They will let all their loyal fans down with a card thats faster than a 580, cheaper than a 580, and overclocks like a beast? Doesn't sound like a let down to me, no matter if the card has hidden stream processors or not.
I don't think Nvidia has much choice with their 480, if they had all 512 cores on the 480 well I think you could add bacon to the list of food that can be cooked on the grillforce 480.
Posted on Reply
#21
ERazer
Horrux said:
You are including all the games for which the driver support is broken, due to being in beta state, in the 11% assessment of overall performance. In other words you are either misleading or misled. Those are not final performance numbers, they are only pre-release numbers. You should try and understand that.
what part you dont get about IMO? couldnt careless if its 50% improvement if IMO its not worth upgrading when most games are console port, sheesh some ppl have the need to correct ppl to the letter, i go by wizz chart that bothers u?
Posted on Reply
#22
radrok
I don't see any problem, you play 1080p and the gain at that resolution does not justify an upgrade for you especially because no game out there can tax your GPU to the limits, it's fine.
BUT it's not a sidegrade either, the card has far more potential under the hood than it shows in reviews and the reason is the HUGE overclockability.
Posted on Reply
#23
H82LUZ73
PremoGS said:
Did you get this card over a year ago? I got my GTX580 over a year ago. If they had made this card a year ago, it would have been something, but now, the card is worthless.
Took the shitty company over a year to beat the GTX580 which was based on Fermi which again, is over 2 years older, what can I say? AMD = :lmao:
WTF dude ,You eat paint chips as a kid ?The 580 is the refresh 480 grill-master that should have been out a year ago.So what if AMD 6970 could only muster speeds out at gtx 570 levels.Boy you say you had AMD and bad drivers more like an idiot at the keyboard....The 7970 is a great card and beats your 580 get over it,Also if you looked up that there Sapphire sheet we talked about in other news threads ,You would see your precious green camp is about to be getting a red camp ass whopping....That mystical card they mention will come trust me.. they will make it.
Posted on Reply
#24
Damn_Smooth
H82LUZ73 said:
WTF dude ,You eat paint chips as a kid ?The 580 is the refresh 480 grill-master that should have been out a year ago.So what if AMD 6970 could only muster speeds out at gtx 570 levels.Boy you say you had AMD and bad drivers more like an idiot at the keyboard....The 7970 is a great card and beats your 580 get over it,Also if you looked up that there Sapphire sheet we talked about in other news threads ,You would see your precious green camp is about to be getting a red camp ass whopping....That mystical card they mention will come trust me.. they will make it.
He's banned. We can quit responding to him.
Posted on Reply
#25
digibucc
ERazer said:
what part you dont get about IMO? couldnt careless if its 50% improvement
to be fair, sidegrade is a pretty specific term. you used the wrong word. why do some people have to turn everything into an argument instead of admitting they were wrong?

this most definitely is not a sidegrade, but an upgrade. personal preferences don't matter.
Posted on Reply
Add your own comment