AMD Radeon HD 7900 ''Tahiti'' Pictured, 384-bit Memory Bus Confirmed?

cadaveca · Dec 8, 2011

pantherx12 said:
It's 2 x 6 pin dude, although having said that the card underneath is 8 and 6.

Um, that's not what I see(I see 8+6 in both cards, and pinout for 8x8):

pantherx12 · Dec 8, 2011

cadaveca said:
Um, that's not what I see(I see 8+6 in both cards, and pinout for 8x8):

http://www.techpowerup.com/forums/attachment.php?attachmentid=44623&stc=1&d=1323369311

I blame blurriness I can't see the edges :laugh:

Can see the one closest to the edge could be an 8 pin now, on the other card looks like it's the other way round XD

mastrdrver · Dec 8, 2011

btarunr said:
BTW, that is a huge GPU package.

Doesn't look any larger then the backside of my 5870s.

cadaveca · Dec 8, 2011

Whatever it is, it's dman exciting. Seeing cards now...does that mean we get a launch within weeks? One can hope...

Casecutter · Dec 8, 2011

btarunr said:
that "Tahiti-XDR2" rumor

Me think's... AMD will hold that and refine it until the top Shelf Kepler's come. Either the XDR2 designation to the existing 7970 or a new model. Consider if they wait... could they release both a Single and Dual XDR2 :rolleyes:

That might send Kepler packing... :nutkick:

Solaris17 · Dec 8, 2011

btarunr said:
Maybe we could discuss memory mapping in another thread?

If you two like, I can spin related posts from this thread off into a new thread in the GPU forum.

So basically your going to change the address space?

btarunr · Dec 8, 2011

Solaris17 said:
So basically your going to change the address space?

No, pressing buttons that change the "t=" value of those posts in the database.

Back to topic.

Delta6326 · Dec 8, 2011

It is 2x 8pin you can tell from the solder points. Now who know you may only need 1x 8 1x 6 to be able to run them.

How long do you think these are they look like they are slightly longer than that M/B so maybe 9.5 -10"?

Lets play a game name those other parts we have
ASUS Crosshair V Formula AM3+ AMD 990FX SATA 6Gb/s...
SanDisk Ultra SDSSDH-120G-G25 2.5" 120GB SATA II I...
CORSAIR Enthusiast Series TX850 V2 850W ATX12V v2....
Just can't figure out the ram or that case maybe a Corsair Obsidian Series 650D (CC650DW-1) Black Ste... hard to tell basing it off a couple screws I can see.

GSquadron · Dec 8, 2011

From what i know they will make high end parts with xdr2 vram
so this is not a high end part. If it is, than there will be no xdr2 vram

erocker · Dec 8, 2011

I doubt the final card will have two 8 pin adapters. Both Cayman and Cypress had two 8 pins on their "engineering samples".

Solaris17 · Dec 8, 2011

erocker said:
I doubt the final card will have two 8 pin adapters. Both Cayman and Cypress had two 8 pins on their "engineering samples".

I agree if anything they did it so they could beat the ES cards to get an idea of theoretical performance instead of basing it off of computer models.

D4S4 · Dec 8, 2011

just wanted to say that that's a f*cking awkward place for a 12th memory chip, especially since it's right between the gpu and pcie connector and there seems to be plenty of room on the other end of the "ring".

btarunr · Dec 8, 2011

D4S4 said:
just wanted to say that that's a f*cking awkward place for a 12th memory chip, especially since it's right between the gpu and pcie connector and there seems to be plenty of room on the other end of the "ring".

As if placing VRM near display outputs wasn't awkward enough (on HD 6800 series reference boards). It doesn't matter.

BrooksyX · Dec 8, 2011

Very nice. Do want!

D4S4 · Dec 8, 2011

btarunr said:
As if placing VRM near display outputs wasn't awkward enough (on HD 6800 series reference boards). It doesn't matter.

thb i never even saw that. seems that crosstalk and other interference are no longer an issue which is nice but one chip so close must have smaller latency than the others, i wonder how they've handled that. i know there are a lot of wavy traces going from memory chips on my x1800.

WarraWarra · Dec 8, 2011

So vram only on one side of the card ?? surely they have vram on both sides of the card or 2x 12 capable ram chip places ??
Would be a waste to have ram on the back side, no cooling for it and only gpu on front under the cooling system.

If they follow the same as with the mGPU's then the top of the range gaming ones has xdr memory in either 2GB/4GB versions.

radrok · Dec 8, 2011

GDDR5 doesn't need that much cooling, my 6990s have some ram on the back of the pcb and they've never had any problem even at 1450mhz.
What's really toasty is the GPU and VRMs

Marineborn · Dec 8, 2011

i seen the supposid specs on these cards, apprently extremly nice, ill pick up 2 when it comes out. to replace my 2 6870's that will be sold at that time

R_1 · Dec 8, 2011

Looks and feels cheap! Where is the back plate?

erocker · Dec 8, 2011

R_1 said:
Looks and feels cheap! Where is the back plate?

Since there's no components on the backside a backplate isn't needed. I'd rather not have a backplate trapping heat on the PCB anyways. It's also an engineering sample. Cayman's ES didn't have a backplate either, the retail 6970 did.

Lionheart · Dec 8, 2011

XDR2 memory could be used for an eyefinity HD7970 version ^_^

radrok · Dec 8, 2011

Also as an exclusive on the 7990 to gain more bandwidth?

badtaylorx · Dec 8, 2011

R_1 said:
Looks and feels cheap! Where is the back plate?

what are you smokin???

i think it looks like they're goin back to a 5XXX style design.....LOVE IT

DarkOCean · Dec 9, 2011

badtaylorx said:
what are you smokin???

i think it looks like they're goin back to a 5XXX style design.....LOVE IT

my thoughts exactly.

Cruise51 · Dec 9, 2011

*drooling on myself*

8-pin might be for pushing clocks? Looks power hungry but that won't stop me from buying it.

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AMD Radeon HD 7900 ''Tahiti'' Pictured, 384-bit Memory Bus Confirmed?

cadaveca

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