Rumour: AMD Tahiti / HD 7900 Specifications & Details

[siopao1984]

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To conclude one of the quietest years for the GPU industry, the rumour mill has been working overtime, fueled by speculation about AMD's upcoming HD 7900 series, codenamed Tahiti. 3DCenter has compiled expected and rumoured specifications, and also mention a tentative release date - 10th January 2012.

The Tahiti chip is rumoured to debut the GCN (Graphics Core Next) architecture, featuring 32 Compute Units with a total of 2048 shaders. TMU count could be 128. The clock speed is likely to be under 1 GHz, providing a theoretical compute potential of around 4 single precision GFlops. Performance for Tahiti XT / HD 7970 could be close to today's dual-GPUs flagships, and considerably faster than GTX 580 and HD 6970.

While most of the above information should be considered as rumours, what we do know is that Tahiti features a 384-bit memory interface, tied to GDDR5 memory. This should lead to memory bandwidth around 250 GB/s. Based on the PCB shots of Tahiti, forum members have used Photoshop to estimate the die size. As we speculated previously, the die size is now reported to be similar to Cayman - around 380 mm². Considering Tahiti will be manufactured at TSMC's 28nm process, this puts the estimated transistor count at a whopping 4.5 billion transistors.Here's another die size estimate from Beyond3D forum :

AMD's Radeon HD 7900 series has been heavily rumoured for a release during CES 2012. The release date is now being pegged at 10th January 2012, Tuesday, and also the day CES 2012 commences. HD 7800 series is expected to release in February, with the dual-Tahiti New Zealand / HD 7990 flagship in March. The rest of the HD 7000 series will be rounded up by Q2 2012.Source: 3DCenter

Read more: Rumour: AMD Tahiti / HD 7900 Specifications & Details by VR-Zone.com

[siopao1984]

More AMD Tahiti / HD 7900 Pictures by VR-Zone.com

Not long after the first pictures of AMD's Tahiti leaked, we have a detailed shot of Tahiti's PCB, which reveals more details. The 12 memory chips are clearly visible, confirming the 384-bit memory bus. It also offers a first glimpse at the Tahiti die.



The card most likely features 1.5 GB GDDR5. The 5+1 phase PWM is also visible. Most importantly, we get the first glimpse of the Tahiti die. It is rotated by 45 degrees and covered by a partial heatspreader. However, the die itself is exposed to the heatsink. Tahiti is a big chip - at first glance a similar size to Cayman. However, it is still visibly much smaller than NVIDIA's previous flagships, GF100/GF110 or GT200/GT200b, so AMD continues to dismiss NVIDIA's big die strategy.

The card features 2x CF connectors as well as the dual BIOS switched introduced with the HD 6900 series.



There is a crucial difference from the previous leak - this sample consists of 2 x 6-pin PCI-e connectors, as opposed to the 8-pin + 6-pin configuration previously captured. This could suggest that this is either an advanced production ready sample, or Tahiti Pro, or HD 7950, which should feature a lower TDP than Tahiti XT / HD 7970. This card thus has a TDP somewhere between 150W and 225W.

Source: VR-Zone Chinese



Read more: More AMD Tahiti / HD 7900 Pictures by VR-Zone.com

[chang87]

cant wait to get my hands on the new hd 7000 series or the gtx 600 series or whatever comes 1st! waheheh

just sold my 560-Ti yesterday and will just use my 2500k igp for the meantime! no games muna! antos mode!

[bim27142]

sakto2x, huwat nlang ko ani, ehehe!

[Lingaw-lingaw_sa_payag]

waaahhh.. aku wa njd ku kahuwat uy...katol na..hahah

[chang87]

gamay'ng antos! dakong tabang! heheh

[akomao]

wait wait wait hahah! unsa man ning nvidia, wla jd gapadungog sa kepler haha

[zoters]

sugod napud ta ani rn huwat2..hehehe

[mE_bytes]

wait wait wait hahah! unsa man ning nvidia, wla jd gapadungog sa kepler haha

ana na bro.. surprise.. hehe! amd/ati una magpa-release then after pila k.months., naa na counterpart sa nvidia.