AMD’s Radeon HD 7800 specifications leaked
Andy Ruffell / 5 years ago
A Japanese website has recently leaked a specifications slide for AMD’s Radeon HD 7800 series. The chip codenamed Pitcairn, is aiming for the price-performance sweet spot, while the HD 7900 series goes onto the high-end and the HD 7700 series remains on entry level.
The slide reveals, however, that the Pitcairn chip doubles up on Cape Verde, with a stream processors count of 1280, 20 computer units, 80 texture units, 2GB of memory on a 256-bit wide interface and 32 ROPs, all of which with a transistor count nearly doubling at 2.8 billion. The series is once again divided into two, the Radeon HD 7870 and the HD 7850.
Starting at the top is the Radeon HD 7870 clocked at 1 GHz which will be branded Radeon HD 7870 GHz Edition (just like the HD 7770). 1280 stream processors at 1 GHz results in a theoretical throughput of 2.56 TFlops, interestingly close to the HD 7950. 2GB GDDR5 is clocked at 4.8 Gbps, providing an effective memory bandwidth of 154 GB/s. The TDP is rated at 175W, slightly more than the HD 6870. The HD 7870 will most likely feature 2×6-pin power connectors. PowerTune will most certainly push up the Max Board Power up closer to 200W if enabled.
The more affordable Radeon HD 7850 gets a small decrease in specifications with 1024 stream processors, 16 computer units and 64 texture units. The HD 7850 is clocked at 860 MHz and rated 1.76 TFlops. It features the same memory subsystem as the HD 7870 with 2 GB GDDR5 offering 154 GB/s bandwidth. The disabled units and lowered core clock allow for a cut down in TDP to 130W. It could ship with only one 6-pin power connector and could potentially become the fastest GPU with such a configuration for a long time to come.
As previously reported, the launch of this new series is expect this month. The same site responsible for the leak mentioned the launch date to be on March 5.