Introduction

AMD launched the premium Radeon R9 Fury X graphics card back in June this year. Designed to compete with the best consumer graphics Nvidia has to offer, Fury X uses a scaled-up GCN architecture and, for the first time, HBM memory for increased bandwidth and potential to build smaller cards.

And while the liquid-cooled Fury X puts AMD back in the big league as far as all-out performance is concerned it's not quite the GeForce-thrashing card that some expected. Of rather more interest to many is what AMD can do with the power efficiencies and massively reduced form factor of HBM memory, and AMD teased the appropriately named Nano a short while back.

Today marks the full Nano reveal, so let's recap on what we already know.

The spec sheet is illuminating insofar as the Nano version uses the full complement of Fiji cores available to the Fury X card. This is a surprise given that the Fury Pro model uses a cut-down version of the die, and we imagine the likes of Asus and Sapphire will not be best pleased at the arrival of a smaller, more efficient card that is potentially faster.

Not only does the R9 Nano feature a full-fat Fiji XT die, the core frequency, quoted as up to 1,000MHz is impressive for a 175W TDP. Further specification exposition is best handled by using a comparative table, so here we go.

Radeon R9 Fury X Radeon R9 Nano Radeon R9 Fury Radeon R9 390X Launch date June 2015 September 2015 July 2015 June 2015 Codename Fiji XT Fiji XT Fiji Pro Grenada XT DX support 12.0 12.0 12.0 12.0 Process (nm) 28 28 28 28 Transistors (mn) 8,900 8,900 8,900 6,200 Approx Die Size (mm²) 596 596 596 438 Full implementation of die Yes Yes No Yes Processors 4,096 4,096 3,584 2,816 Texture Units 256 256 224 176 ROP Units 64 64 64 64 Peak GPU Clock/Boost (MHz) 1,050 1,000 1,000 1,050 Peak GFLOPS (SP) 8,602 8,192 7,168 5,914 Peak GFLOPS (DP) 537 512 448 739 Memory Clock (MHz) 1,000 1,000 1,000 6,000 Memory Bus (bits) 4,096 4,096 4,096 512 Max bandwidth (GB/s) 512 512 512 384 Default memory size (MB) 4,096 4,096 4,096 8,192 Memory type HBM HBM HBM GDDR5 Power Connectors 8+8-pin 8-pin 8+8-pin 8+6-pin TDP (watts) 275 175 275 275 GFLOPS per watt 31.28 46.81 26.06 21.50 Current price (Newegg) $649 $649 $549 $429

Radeon R9 Nano is in fact very close to the potential of the Fury X card; the only meaningful difference, from a performance point of view, appears to be a slightly reduced core speed. The back-end of the GPU is the same so it's reasonable to assume that it should benchmark at approximately 90 per cent of the level exhibited by AMD's best-ever GPU.

It bears repeating that AMD is able to shoehorn a sizeable amount of power into a card that consumes 175W TDP, or over one-third less than the liquid-cooled Fury X. AMD is picking the very best Fiji XT silicon, examining how it behaves when run at lower voltages, and then passing a select few for R9 Nano duties.

It's not just about speed, as AMD is keen to point out, as the 6in-long card fits into Mini ITX systems that are naturally too small for cards such as the R9 290/390X and rival high-performance GPUs from Nvidia. AMD also believes the Nano's speed is more than enough to handle the very best Mini ITX cards from Nvidia's stable, currently led by the GTX 970 Mini.

R9 Nano makes most sense for gamers who want a small-form-factor system that has enough graphics horsepower to drive the latest games at tasty resolutions. On paper it's also a good candidate for a deluxe Steam Box for the living room, though the absence of HDMI 2.0 may scupper immediate interest for those of you looking to game on a 4K TV.

AMD is promising lots of performance in a tiny card, underscored by the R9 Nano using the full array of Fiji XT cores and lots of bandwidth. That's all well and good but one problem in popularising such a card is the limited scenarios that benefit its small-form-factor credentials. For example, Mini-ITX chassis that only accommodate sub-200mm cards are few and far between - the Lian Li PC-Q33 and Cooler Master Elite 110 are obvious examples - but others tend to have enough room to house 9.5-10.5in cards that integrate high-performance GPUs as standard.

Radeon R9 Nano is a case of producing the smallest card that's genuinely premium in performance. The upshot of such an approach is an etail price of $649 (£520). AMD, though, knows that the tiny footprint will appeal to enough of an audience for the R9 Nano to sell out. Just like its bigger brother, the R9 Fury X, AMD is mandating the exact design of the card; partners will, in the first instance, simply place a sticker on the fan and differentiate on bundle and etail availability.

We're always enthused when a manufacturer pushes the boat out and develops a product that is like no other. The R9 Nano fits that bill perfectly.