According to a block diagram of AMD's new 28 nm "Tonga" silicon, it features the same amount of shading power as "Tahiti," if not more. The chip features a total of 2,048 Graphics CoreNext 1.1 stream processors, spread across 32 compute units (CUs). The chip also features 128 TMUs. The block diagram was part of press-material AMD distributed with its recently launched FirePro W7100 professional graphics card, which is based on "Tonga."

The W7100 uses just 28 of the 32 CUs, and hence features 1,792 stream processors. Other features of "Tonga," according to the block diagram, include a 256-bit wide GDDR5 memory interface, 32 ROPs, TrueAudio DSP, and a modern XDMA CrossFire interface. The first consumer graphics card based on this chip is the Radeon R9 285. It is expected to feature 1,792 stream processors, and offer performance rivaling the Radeon HD 7950 Boost at lower power draw, and priced to compete with the GeForce GTX 760. That could leave the possibility of a future "R9 285X" with the chip's full complement of stream processors.

Here are the first pictures a HIS branded Radeon R9 285, the third in a series of leaked press-shots of cards based on AMD's new performance-segment GPU, designed to take on NVIDIA's bestselling GeForce GTX 760 in not just performance, but also energy-efficiency. The card is based on a new ASIC, codenamed "Tonga," which is rumored to feature a stream processor count identical to one of the variants of "Tahiti," and a 256-bit wide GDDR5 memory interface, holding 2 GB of memory. HIS' card features a compact variant of the company's IceQ X² cooling solution. Its pictures also reveal that the R9 285 "Tonga" will feature XDMA CrossFire, much like the R9 290 series.

In addition to a Sapphire-branded Radeon R9 285, pictures of an XFX branded one surfaced, too. The Radeon R9 285 is a new SKU being designed by AMD to take on the GeForce GTX 760 in not just performance, but also energy efficiency. It's rumored to be based on a brand new 28 nm silicon, codenamed "Tonga," which features GCN2 stream processor count identical to one of the variants of "Tahiti," and a 256-bit wide memory interface. The card thus features 2 GB of memory. XFX gave its card its signature Double Dissipation (DD) cooling solution.

Here are the first pictures of the card AMD hopes to take on NVIDIA's bestselling GeForce GTX 760 with, the Radeon R9 285. This particular one, branded by Sapphire, featuring its Dual-X cooling solution. The R9 285 is based on a brand new chip by AMD, codenamed "Tonga." It's rumored to feature the same stream processor count as one of the "Tahiti" variants, while featuring higher clocks, and a narrower 256-bit wide GDDR5 memory interface, a fact confirmed by this card's marketed 2 GB of memory. Given how marketing material of the R9 285 is ready, its launch may not be far away.