AMD Radeon R9 285 Tonga Graphics Cards From Various AIBs Pictured – Features XDMA CrossFire Technology

Hassan Mujtaba
Posted 2 years ago

AMD Radeon R9 285 Tonga Graphics Cards From Various AIBs Pictured

AMD’s Tonga GPU is codenamed the Radeon R9 285 and features the Tonga GPU. It cannot be said whether this is the full core or a skimmed up core “Tonga Pro” since there’s a possibility that the fully enabled core could have the Radeon R9 285X codename. Regardless, we are looking at performance on the levels of Radeon R9 280 while keeping the thermal specs and power consumption at R9 270X levels. This suggests that the Tonga GPU is highly efficient and AMD took this approach due to NVIDIA’s recent Kepler launches which turned out to deliver great performance at absolute low TDPs of 65W (GeForce GTX 750 series).

For specifications, the card will feature a 2 GB GDDR5 memory running across a 256-bit bus interface and the clock speeds are maintained at 918 MHz core and 1375 MHz memory which result in a cumulative bandwidth of 176 GB/s. The power is provided through dual 6-Pin connectors and display outputs include Dual-DVI, HDMI and a display port for all three cards. We don’t have any specifics regarding the core count and the number of raster operation units but we should focus on the details we now have whilst looking at the Radeon R9 285 cards. The bandwidth is major decline over the R9 280X which features a 288.0 GB/s cumulative bandwidth so maybe the card is less dependent on it and there’s some secret sauce inside the GPU which we don’t know about yet.

The cards we are looking at are from Sapphire (Radeon R9 285 Dual-X), XFX (Radeon R9 285 Double Dissipation) and HIS (Radeon R9 285 IceQ X2 Mini). If you might have noticed, then all these cards feature a heatsink that is featured on the Radeon R9 270 series cards rather the Radeon R9 280 which features more beefy cooling and heatsink solutions. The reason behind this could be the fact that the card consumes lesser power and runs much cooler than what we are used to on Tahiti based cards. As mentioned before, the card is specifically a Radeon R9 270 in terms of design but boasts R9 280 performance thanks to core performance improvements. The design and GPU architecture for Tonga are new and remain a mystery until the cards are fully shown off so that is one reason we can think for the change. The card also isn’t much longer than the R9 280 cards and actually a tad bit smaller so AMD has learned to managed components on their PCBs. It’s not known whether these cards use the reference PCB, but from the looks of it, they are featuring custom designed PCBs.


There’s another interesting thing regarding Radeon R9 285 that is the card makes use of AMD’s XDMA CrossFire technology. At the side of the PCB, we can see that AMD hasn’t featured Crossfire gold fingers but instead went with their XDMA route allowing upto 2 GPUs to work in harmony sharing an interconnect path via the PCI-e. This technology has already proved well for the Hawaii graphics cards and the reason why no other cards than Hawaii and Tonga feature this is because the rest of AMD’s lineup were rebrands of previous generation chips.

The Radeon R9 285 will be price in the $300 US range which means that Tahiti based cards will be receiving a major price cut as hinted previously to make room for the new cards otherwise having both Tahiti XT and Tonga at the same price will mean poor sales for the inferior product of the two. The card will launch in Q3 2014 and the exact date is pitted somewhere around late August  but it is definitely coming out soon and we will start receiving more information in the coming weeks.

AMD Radeon R9 285 “Tonga” Specification Sheet”:

AMD Radeon R7 260X AMD Radeon R9 270 AMD Radeon R9 270X AMD Radeon R9 280 AMD Radeon R9 280X AMD Radeon R9 285 AMD Radeon R9 290 AMD Radeon R9 290X AMD Radeon R9 295X
AMD Radeon R9 295X2
GPU Core Neptune XT Curacao Pro Curacao XT Tahiti Pro Tahiti XT Tonga Pro? Hawaii Pro Hawaii XT Hawaii XTX Vesuvius
GPU Process 28nm 28nm 28nm 28nm 28nm 28nm 28nm 28nm 28nm 28nm
GPU Cores 896 1280 1280 1792 2048 TBC 2560 2816 2816 5632
Core Clock 1100 MHz 900 MHz 975 MHz 933 MHz 1000 MHz 918 MHz 947 MHz 1000 MHz ~1100 MHz 1018
Memory Clock 1625 MHz 1400 MHz 1400 MHz 1250 MHz 1500 MHz 1375
1250 MHz 1250 MHz ~1250 MHz 1250 MHz
Memory Bus 128-bit 256-bit 256-bit 384-bit 384-bit 256-bit 512-bit 512-bit 512-bit 512-bitx2
Memory Bandwidth 104.0 GB/s 179.2 GB/s 179.2 GB/s 224.4 GB/s 288.0 GB/s 176.2 GB/s 320 GB/s 320 GB/s 320 GB/s 320 GB/s x 2
TMUs / ROPs 56 / 16 80 / 32 80 / 32 116 / 32 128 / 32 TBA 160 / 64 176 / 64 176 / 64 176 / 64 x 2

AMD Radeon R9 285 AIB Cards Pictures (Image Credits: Videocardz):Sapphire Radeon R9 285 Dual-X XFX Radeon R9 285 Double Dissipation

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