AMD Radeon R9 285X "Tonga XT" Graphics Card Reportedly Features 2048 SPs, 384-Bit Bus and 3 GB GDDR5 VRAM

According to a report published past Fudzilla, AMD's Radeon R9 285X graphics card which features the fully enabled Tonga XT GPU volition launch in September. The Radeon R9 285X volition be powered past the Tonga GPU featured in AMD's upcoming FirePro W7100 and Radeon R9 285 graphics cards featuring lower power draw compared to previous generation Tahiti core while being faster in terms of performance.

AMD Radeon R9 285X "Tonga XT" Graphics Card Reportedly Features 2048 SPs, 384-Fleck Motorbus

When I saw the AIB made Radeon R9 285 that leaked lasat week, I mentioned that the cards featured a lower tier heatsinks compared to the Radeon R9 280 and Radeon R9 280X graphics cards which fabricated me incertitude their overall performance but from the contempo FirePro W7100 launch, it seems like AMD has indeed made some gains in process design optimization which is the reason why the Tonga GPU ends up consuming manner lesser power than the Tahiti Pro and Tahiti XT variants we have seen over the last 2 years. For comparison, the recently released FirePro W7100 has a sub-150W TDP while Tahiti Pro featured on the FirePro W8000 has a 225W TDP with the Radeon R9 280 "Tahiti Pro" featuring a TDP of 250W due to higher clock speeds. I am not comparison the W7100 with the W7000 since that was based off the Pitcairn cadre which isn't a direct comparison to the specifications reported for the Tonga GPU.

The specifications of the Tonga GPU take been confirmed and we have already seen block diagram of the Pro variant just a few hours ago which ostend that the Radeon R9 285 will feature 1792 stream processors configured in 28 compute units. Based on the GCN 1.1 die, the Tonga GPU has 32 Compute Units in full simply we are looking at a toned downward version which has four CUs disabled resulting in the 1792 SPs variant. The Tonga GPU has 4 triangles per clock cycle, 32 ROPs, 112 TMUs, L2 cache of 512/1024 KB and a 256-chip retentivity controller. The Radeon R9 285 features a 4 GB GDDR5 memory running across a 256-bit autobus pumping out a cumulative bandwidth of 176 GB/south since its clocked at 1375 MHz . The Tonga GPU was ever meant to be highly efficient and AMD has toned downward its TDP to sub-150W and then we can say a TDP of 150W is what's to look from the consumer Radeon R9 285 variant which goes on sale this calendar month.

From the block diagram comparison posted by Hardware.Fr, we can run into that the Tonga GPU houses eight ACE (Asynchronous Compute Units) compared to just two on Tahiti and each shader engine has its own geometry processor and a rasterizer unit which houses eight Compute Units per cake. The Tonga Pro variant has two of these CUs disabled resulting in 1792 stream processors. The Multimedia accelerators cake has been updated with the XDMA CrossFire engine and addition of TrueAudio DSPs which deliver the TrueAudio tech. Last we can run across a large L2 cache, part of which is blacked out which points that this model doesn't feature the full cadre but it does have a larger cache compared to Tahiti which may tell why the card is less resilient to bandwidth.

Merely the most interesting news comes from Fudzilla that the Radeon R9 285X which is the reported name for the Tonga XT based variants features the total 32 CU dice which includes 2048 stream processors, 32 ROPs and 128 TMUs. Nosotros don't have any specifics regarding the clock speeds, even the ones reported for the Radeon R9 285 are based off mill overclocked variants so we can't be and so sure but 918 MHz is what'south beingness said the reference clock for Radeon R9 285 so we can await something around 933 MHz+ for the Tonga XT variant. What's weird is that the Radeon R9 285X is allegedly featuring a 384-bit memory charabanc compared to 256-bit motorcoach on its Pro variant and also includes a college VRAM updated from 2 GB to iii GB.

The Radeon R9 285 is already considered a mid-tier board from its looks and design but the Radeon R9 285X could be a decent update over Radeon R9 280X' Existence like to Tahiti in board pattern simply the updated core with new architecture will leverage the operation and while the Tahiti XT variants have a TDP of 250W, nosotros can see a sub 200W TDP for Tonga XT variants which make it in September every bit reported by the source. The pricing for the Radeon R9 285 could fall in between $250 US while the Radeon R9 285X could retail at $300 U.s. since Tahiti XT and Tahiti Pro based cards have already received major price cuts during the concluding few months. Practise note that the specifications for the Tonga Pro and the 32 CU full die for Tonga XT is more or less confirmed however we tin't say for sure whether the 384-bit motorbus bit seems legit. We have to wait a bit to confirm this.

AMD Tonga Pro and Tonga XT Cake Diagram Comparisons:

AMD Radeon R9 285 "Tonga" Specification Sail":

	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 285X	AMD Radeon R9 290	AMD Radeon R9 290X	AMD Radeon R9 295X "Rumor"	AMD Radeon R9 295X2
GPU Core	Neptune XT	Curacao Pro	Curacao XT	Tahiti Pro	Tahiti XT	Tonga Pro	Tonga XT	Hawaii Pro	Hawaii XT	Hawaii XTX	Vesuvius
GPU Process	28nm	28nm	28nm	28nm	28nm	28nm	28nm	28nm	28nm	28nm	28nm
GPU Cores	896	1280	1280	1792	2048	1792	2048	2560	2816	2816	5632
Cadre Clock	1100 MHz	900 MHz	975 MHz	933 MHz	1000 MHz	918 MHz	TBA	947 MHz	1000 MHz	~1100 MHz	1018 MHz
VRAM	2 GB GDDR5	two GB GDDR5	2 GB GDDR5	3 GB GDDR5	iii GB GDDR5	2 GB GDDR5	3 GB GDDR5?	4 GB GDDR5	4 GB GDDR5	4 GB GDDR5	8 GB GDDR5
Memory Clock	1625 MHz	1400 MHz	1400 MHz	1250 MHz	1500 MHz	1375 MHz	1500 MHz?	1250 MHz	1250 MHz	~1250 MHz	1250 MHz
Memory Bus	128-bit	256-fleck	256-bit	384-bit	384-bit	256-bit	384-bit?	512-fleck	512-bit	512-fleck	512-bitx2
Retentivity Bandwidth	104.0 GB/s	179.2 GB/southward	179.2 GB/due south	224.4 GB/southward	288.0 GB/due south	176.2 GB/southward	288.0 GB/s?	320 GB/southward	320 GB/due south	320 GB/s	320 GB/s x 2
TMUs / ROPs	56 / 16	80 / 32	80 / 32	116 / 32	128 / 32	112 / 32	128 / 32	160 / 64	176 / 64	176 / 64	176 / 64 ten ii

Source: https://wccftech.com/amd-radeon-r9-285x-tonga-xt-graphics-card-reportedly-features-2048-sps-384bit-bus-3-gb-gddr5-vram/

Posted by: gonzalezhicustant91.blogspot.com

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