System Load: (HD 4850 in CrossFire + 3Dmark06) + (Phenom + Prime95) -> 427 W
Seems like you have to buy a new PSU...
link
Last edited by a moderator:
AMD: R7xx Speculation
- Thread starter Unknown Soldier
- Start date
- Status
System Load: (HD 4850 in CrossFire + 3Dmark06) + (Phenom + Prime95) -> 427 W
Seems like you have to buy a new PSU...
link
Ok, so breaking it down, I get a picture rounded out to look something like this (give or take):
GTX 280 = 4850x2 ($649 vs $400)
GTX 280 SLI = 4850x4 = 4870x3 ($1300 vs $800 vs $900)
GTX 280 3-way SLI = 4870x4.....both of which are bottlenecked... ($1950 vs $1200)
GTX 260 >= 4870 ($400 vs $300)
GTX 260 SLI = 4850x3 >= 4870x2 ($800 vs $600 vs $600)
GTX 260 3-way SLI = 4850x4 >= GTX 280 SLI = 4870x3 ($1200 vs $800 vs $1300 vs $900)
Crazy huh?
1. This is not taking into account 'X2' products pricing, which could be greater or less than 2x the single cards.
2. X4 is a rough approx of X4 or 48x0X2x2.
3. 4850 is going to kick ass.
GTX 280 = 4850x2 ($649 vs $400)
GTX 280 SLI = 4850x4 = 4870x3 ($1300 vs $800 vs $900)
GTX 280 3-way SLI = 4870x4.....both of which are bottlenecked... ($1950 vs $1200)
GTX 260 >= 4870 ($400 vs $300)
GTX 260 SLI = 4850x3 >= 4870x2 ($800 vs $600 vs $600)
GTX 260 3-way SLI = 4850x4 >= GTX 280 SLI = 4870x3 ($1200 vs $800 vs $1300 vs $900)
Crazy huh?
1. This is not taking into account 'X2' products pricing, which could be greater or less than 2x the single cards.
2. X4 is a rough approx of X4 or 48x0X2x2.
3. 4850 is going to kick ass.
Jawed
Legend
The Qimonda white paper is useful:Ah ok. So 1gbit gddr5 chips will, in fact, not be available. I think generally graphic card manufacturers try to avoid the twice-as-many-chips configuration - different board layout (or if only one it must be designed for twice as many chips hence a bit more complicated), signal noise problems etc. (so can't achieve quite the same memory clock). Much easier if you can just swap in the same number of larger parts. Not that this is really a disavdantage compared to GTX260, which needs 14 chips (with much more complicated pcb routing) anyway
http://www.qimonda-news.com/download/Qimonda_GDDR5_whitepaper.pdf
Clamshell mode is promoted for inventory reasons - I guess this is most attractive to the memory companies and I suppose this means the price of GDDR5 matures more quickly if there are less SKUs.
I presume AMD will just make the one board for HD4870 512MB/1GB variants - this seems normal with high-end cards.
I think the different memory companies will specialise in the varied capacities of GDDR5 chips. I think Hynix has 1Gb GDDR5 chips, while Samsung is doing 512Mb chips:
http://www.beyond3d.com/content/news/538
Jawed
I was refering to the whole diagram - most notably the different tu layout (tu per array not share across arrays thus 40 tus) compared to rv670.
Qimondas website says July 8:th for 1Gb availability.
Date feels familiar somehow
Qimonda GDDR5
IDGV1G-05A1F1C-40X 1Gb, 32Mx32, 4.0Gbps, available July 08 PG-TFBGA-170 on request
Downloads Data Sheet - 1.0 MB
IDGV1G-05A1F1C-45X 1Gb, 32Mx32, 4.5Gbps, available July 08 PG-TFBGA-170 on request
Downloads Data Sheet - 1.0 MB
IDGV1G-05A1F1C-50X 1Gb, 32Mx32, 5.0Gbps, available July 08 PG-TFBGA-170 on request
Downloads Data Sheet - 1.0 MB
I still don't quite understand how clamshell mode actually works. Are all signals actually routed to both chips which belong together (e.g. for easy routing you could for instance put the chips on the front and back of the pcb) and in clamshell mode half of the ios are inactive (tri-stated)? Looks like it has to work that way somehow.
Hmm, and qimonda has 516Mb chips "in production" and 1Gb chips "available july" - whatever available actually means.
So actually maybe clamshell mode may not even be needed for 1GB cards - though if the board layout is indeed designed for this, I'm sure we'll see 2GB cards rather sooner than later
.Well, not really. Don't forget scaling isn't that good, and often next to nothing with more than 2 cards (imho more than 2 cards are useless if only because of input lag even if it does scale). R700 might or might not suffer from this, but using multiple cards probably still will...
You're a bit late
Jawed
Legend
Shame Kej's posting, pointing out the 8th July availability date for 1Gb GDDR5 from Qimonda, didn't make it - spam filter at work...
Jawed
That's how I'm interpreting it.
Funny, I really was thinking they'd stick with just 512Mb chips - for inventory reasons. I suppose this means 2GB Firestream cards will turn up, but I wonder if AMD will match the 4GB capability of GT200 in Quadro/Tesla form any time soon - seems unlikely. GDDR5 is intended to come in 2Gb versions eventually...Hmm, and qimonda has 516Mb chips "in production" and 1Gb chips "available july" - whatever available actually means.
So actually maybe clamshell mode may not even be needed for 1GB cards - though if the board layout is indeed designed for this, I'm sure we'll see 2GB cards rather sooner than later
Jawed
Well, maybe we could see 2xRV770 Firestream cards,with a total of 4GB memory, with 32 1gbit chips (a true monster card - then again the 4GB tesla card also probably has 32 chips with 2 ram chips sharing all io). Though that would of course only make it really 4GB if that can somehow be used as unified memory...
Would be a neat card anyway - a single card with more (ok peak) dp flops as nvidias rack-mount full of GT200
Jawed
Legend
I forgot about that. But I wonder if X2 boards can only accommodate a maximum of 16 chips (as the PLX chip takes up a pile of space). So still only 4GB with 2Gb chips. Hmm...
Jawed
Okay, I am confused is the 4870 a 4850 with gddr5 or will parts of it be disabled?I've seen pics of the 4870 with two six pin connectors where as the 4850 has one so obviously the 4850 is missing something....
Wouldn't a 4870x2 take a massive amount of power to run if one takes two connectors?
Wouldn't a 4870x2 take a massive amount of power to run if one takes two connectors?
Is there no bridge chip available in a much smaller package? Still you're right I have trouble seeing 32 ram chips alongside two rv770 and all the other stuff needed on a single pcb...
Nothing disabled just lower clocks - thus likely lower voltage which can make an enormous difference.
Yes it would require quite a lot maybe it's clocked lower (like 4850) - little is known about the R700...
It seems unlikely there's anything disabled on the 4850 that's going to be enabled on the 4870 (aside from GDDR5).
I'd expect the 4870x2 to be around the 9800GX2 in power consumption, maybe a bit more. I really don't expect to see a 1GB /gpu version.
Jawed
Legend
Yeah, instead of being 37.5x37.5
http://www.plxtech.com/products/expresslane/pex8547.asp
the newer chip is 27x27:
http://www.plxtech.com/products/expresslane/pex8648.asp
Jawed
- Status
