Moving on to product stacks and competition, it comes as no great surprise that AMD is placing their newest flagship part directly opposite NVIDIA’s flagship cards. Consequently this pushes the idle TDP of the 7990 down to around 20W, which is greater than a single card, but a clear improvement over 6990 and earlier AMD dual-GPU cards. The biggest benefits are found in multi-card setups since this allows the fans on those slave cards to be shut down, but even on the 7990 it still provides a benefit by allowing AMD to curtail their idle power consumption. ZeroCore as you might recall allows AMD to almost completely shut off slave GPUs when they’re not in use, which in turn allows AMD to further reduce their idle power consumption. While we’re on the subject of power, this is the first official AMD dual-GPU part to include AMD’s ZeroCore power technology, which was introduced with the GCN family. The end result is that while an unofficial 7990 would be a 450W+ part, AMD can deliver the same or better performance while consuming much less power, putting the 7990 within the all-important 375W envelope that OEMs and boutique builders look for. As the GPU manufacturer AMD has the ability to do finely grained binning that their partners cannot, so while Asus and PowerColor have essentially been putting together cards that really are two 7970s on a single card – right down to the TDP – official 7990s get the advantage of AMD’s binning process, significantly reducing power consumption. AMD’s 7990 has an official TDP of just 375W, which although common for official dual-GPU cards, is quite a bit lower than the TDPs of the unofficial 7990s. In fact this is better than some of the earlier 7990s such as PowerColor’s, which were clocked lower and simultaneously lacked PT Boost.īut perhaps the most defining aspect of AMD’s 7990, and the thing that sets it apart from unofficial 7990s that came before it is the TDP. As a result the 7990 is surprisingly close to being a 7970GE Crossfire setup on a single card, clocked just 50MHz below AMD’s single-GPU flagship card. Meanwhile the memory is clocked at 6GHz, the same as the 7970GE. The 7990 is a PowerTune Boost part like the 7970GE it’s based on, giving the card a base clockspeed of 950MHz, and a boost clock of 1000MHz. The big question with any dual-GPU card of course is what kinds of clockspeeds it can run at, and as a turns out the 7990 can clock rather high. Joining these GPUs is 6GB of GDDR5 RAM, split up between the two GPUs for the 7900-series standard of 3GB of VRAM per GPU.
AMD RADEON HD 7990 FULL
AMD has held nothing back and these are fully enabled GPUs, so each GPU has all 2048 stream processors, 32 ROPs, and their full 384-bit memory buses present. For AMD and their partners going official doesn’t just mean the AMD is taking a greater role in matters, but as we’ll see it means changing the rules of the game entirely.ĭiving right into the thick of things, like the officially unofficial cards before it, AMD’s 7990 is a dual-Tahiti part, placing two of AMD’s flagship GPUs on a single PCB to make a single card. This isn’t going to be the first 7990 – that honor belongs to PowerColor’s 7990 – but this is unquestionably the most important 7990.
AMD is getting into the game with their own 7990 design, and perhaps more importantly they’re doing so while coming to bear with the kind of engineering resources that only a GPU manufacturer can provide. Consequently, up until this point the 7990 has been “officially unofficial”, reflecting the fact that the first 7990s were AMD sanctioned products, but not based on AMD designs.īut at long last the 7990 is becoming fully official.
AMD RADEON HD 7990 SERIES
Instead the 7000 series has played out in reverse: Asus and PowerColor released their designs first. In a typical year we would see AMD release a standard design, and then later on partners like Asus and PowerColor would release their own custom designs in the name of product differentiation and squeezing out just a bit more performance. Of course with that said, like so many other facets of the 7000 series, the dual-GPU situation has played out rather unusually in the past year. As a result, though these cards aren’t necessarily obligatory, with each generation we’re left eagerly awaiting just what AMD has in store for their capstone product.
Filling a small-but-important niche for AMD, dual-GPU cards allow AMD to both deliver ultra-enthusiast performance levels their traditional single-GPU products can’t offer, and at the same time compete with NVIDIA’s big die flagship cards without AMD needing to produce a big die GPU of their own. Officially canonized back in 2008 with AMD’s “small die” strategy, dual-GPU cards have since become a staple of AMD’s product lineup.
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