AMD Radeon R9 285X with full-scale Tonga XT sees the light of day

Just over two years ago, AMD launched the Radeon R9 285 graphics card, which became the first with the Tonga graphics circuit. However, it quickly became clear that it was not Tonga in its full version, but that a number of calculation units and a whole third of the memory bus were disabled. This would instead come with R9 285X which for as yet unknown reasons was put on the shelf.

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1 Specifications: – AMD Radeon R9 285X

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With the Radeon 300 series, AMD relaunched the R9 285 as the R9 380 along with the R9 380X which was gifted with all 2,048 stream processors enabled in the circuit. However, the memory bus remained at 256 bits and in the end, full-scale Tonga was never launched.

Specifications: – AMD Radeon R9 285X

	Radeon R9 380X	Radeon R9 380	Radeon R9 285X	Radeon R9 285
GPU	Antigua XT (Tonga)	Antigua Pro (Tonga)	Tonga XT	Tonga Pro
Technical	TSMC 28 nm	TSMC 28 nm	TSMC 28 nm	TSMC 28 nm
Architecture	GCN 3.0	GCN 3.0	GCN 3.0	GCN 3.0
Streamproc.	2 048 st.	1 792 st.	2 048 st.	1 792 st.
Texture units	128 st.	112 st.	128 st.	112 st.
Raster units	32 st.	32 st.	32 st.	32 st.
Memory bus	256-bit	256-bit	384-bit	256-bit
Memory amount	4 GB	2/4 GB	3 GB	2/4 GB
Minnestyp	GDDR5	GDDR5	GDDR5	GDDR5
GPU frequency	Up to 970 MHz	Up to 970 MHz	Up to 1,000 MHz	Up to 918 MHz
Memory frequency	5 700 MHz	5 700 MHz	5 500 MHz	5 500 MHz
Memory bandwidth	182 GB/s	182 GB/s	264 GB/s	176 GB/s
Power supply	6+6-pin	6+6-pin	6+8-pin	6+6-pin
TBP	190 W	190 W	–	190 W

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On the forum Overlock.net, the user “ZealotKi11er” publishes what is said to be the reference design of the Radeon R9 285X, where the fact that the graphics card has twelve instead of eight memory capsules reveals the memory bus 384 bits. The whole thing is also confirmed by a validation with the identification program GPU-Z.

The wider memory bus means that the graphics card would come with 3 GB GDDR5 and get 50 percent higher bandwidth than the Radeon R9 285. The clock frequency for the graphics circuit itself would go up to 1,000 MHz, which is not only higher than the R9 285 but also the Radeon 300 series R9 380 and R9 380X with the same graphics circuit.

The pictures on the circuit board reveal that the graphics card would have a good power supply compared to the Radeon R9 285. Instead of two 6-pin PCI Express, the R9 285X has a 6-pin and an 8-pin, which means a power consumption of up to 300 W according to ATX -standard.

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The inflated specifications do not only mean higher power consumption. The user also takes the opportunity to run a round 3DMark Time Spy, where the Radeon R9 285X gets 3,104 in graphics points, which is 17 percent higher than the 2,656 that the R9 285 takes home in the same test.

Source: Videocardz.