ATI's Single-PCB Dual-GPU Plans
Anh Tuan Huynh
June 25, 2006 12:31 PM
comment(s) - last by
HIS X1600 Gemini Courtesy of HKEPC
Single-board dual RV570 boards in the pipeline
upcoming RV560 and RV570
will find its way into single-board, dual-GPU CrossFire configurations. Since the GPU cores have integrated composite engines, the cards are capable of Crossfire support directly on the card.
ATI is recommending to its AIB partners that the new 80nm mainstream and value parts will be joined together on a single PCB with a PLX Technology ExpressLane PEX 8532 PCI Express bridge chip. This bridge chip is currently used on ATI
graphics cards such as the
GeCube dual X1600 graphics card.
The bridge chip itself is nearly the same size as the GPU but only draws approximately 7.38 watts. Preliminary boards show the PEX 8532 heatsink-less which isn’t surprising considering its low power draw.
graphics boards the
PEX 8532 bridge chip (PDF)
takes one PCI Express x16 interface and divides the bandwidth in half. This allocates eight PCI Express lanes to each GPU similar to how some motherboards divide sixteen PCI Express lanes across two slots on Intel, lower end SLI and CrossFire motherboards. As the PEX 8532 is a generic PCI Express switch it can be used for other implementations besides graphics switching also.
has learned Hightech Information Systems (HIS) has
dual RV570 products
in the pipeline using the PEX 8352 bridge chip. Although RV570 won’t necessarily offer as much horsepower as a
variants will be able to dedicate one RV570 GPU to
; essentially one GPU can be used for graphics while the second can be used for physics or graphics. Additionally, up to four DVI outputs can be used per card with the help of
twin DMS59 interfaces
80nm RV560 and RV570 are expected
to arrive in August and September.
This article is over a month old, voting and posting comments is disabled
RE: What's old is new...
6/26/2006 1:22:53 AM
The design was revolutionary for the time, but I think too much bandwidth was lost to rendering overhead. As I recall, each GPU was responsible for rendering every other frame. The "load balancing" between the GPU's led to lackluster performance compared with what was viewed as the technology's potential.
Current multi-GPU solutions offer a variety of rendering scenarios to mitigate the effects of unfavorable performance in certain situations. Anyway, I'm happy to see ATI develop a single card solution because it will inevitably be cheaper to produce/purchase than the competition is offering at the moment.
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