The reference Radeon HD 4670
ATI's claiming a maximum TDP of around 60W for the HD 4670 GDDR3 SKU and under 50W for the DDR2-equipped version. That's why you see the '70 card, above, ship on a small-ish PCB.
You wouldn't think that this diminutive board has more compute power (GFLOPs) than the much-vaunted, big-ass R600 (aka Radeon HD 2900 XT), would you? It shows what 18 months can bring to the table.
A couple of CrossFireX fingers means that you can daisy-chain another three boards for greater rendering, motherboard permitting. Most folk looking towards multi-GPU usage will just add another, we reckon.
Our sample, provided by AMD, shipped with GDDR3 memory from Hynix. The eight 512Mbit modules equally are split over both sides, and they are nominally rated at 2Gbps per pin. (2GHz/s for the complement of eight, then).
There's nothing particularly exciting about the front, save to say that a motherboard's PCIe x16 slot offers enough juice not to require auxillary power.
Hmmm. Interesting. It's digital all the way on the backplate. The sole DVI port handles dual-link (2,560x1,600) connectivity, of course.
