AMD Radeon R9 270 review - A new Island and Technology

It's them Islands Again !

So let's deal with a quick overview of the AMD new product range first. Over the past two years you have been hearing about several codenames and that can be a little confusing. It's simple really, in the market we have entry level, mainstream and high-end products. When you notice 'Cape Verde', that's entry level, the 7700 series that was just released. Pitcairn would be the codename the mainstream products (7800) will hide under, and Tahiti is the codename for the GPUs used on AMD's most high-end graphics cards. 

• Entry level = Cape Verde = Radeon HD 7700 series / R5 series
• Mainstream level = Pitcairn = Bonaire Radeon HD 7800 series / R7/R9 series
• High-end level = Tahiti = Radeon HD 7900 series / R9 series
• Enthusiast level Hawaii = R9-290 and 290X

The entire segment from top to bottom has been released in Q1 2012, but most of the 2013 models are respins, the exception being the R7-260X and the R9-290/290X graphics cards.

R7 240

• Stream Processors 320
• Clock Frequency up-to 780 GHz
• 499 GFLOPS compute performance
• 1 or 2 GB memory at 4.6 Gbps / 128-bit
• 30W TDP
• PCI-E 3.0
• API - DirectX 11.2 / OpenGl 4.3 / Mantle

R7 250

• Stream Processors 384
• Clock Frequency up-to 1.05 GHz
• 806 GFLOPS compute performance
• 1 or 2 GB memory at 4.6 Gbps
• 65W TDP
• PCI-E 3.0
• API - DirectX 11.2 / OpenGl 4.3 / Mantle

R7 260X

• Stream Processors 896
• Clock Frequency up-to 1.1 GHz
• 1.97 TFLOPS compute performance
• 2 GB memory at 6.5 Gbps / 128-bit
• 115W TDP
• PCI-E 3.0
• API - DirectX 11.2 / OpenGl 4.3 / Mantle

R9 270 (previously the R7870 / Pitcairn)

• Stream Processors 1280
• Clock Frequency up-to 925 MHz
• 2.37 TFLOPS compute performance
• 2 memory at 5.6 Gbps / 256-bit
• 150W TDP
• PCI-E 3.0
• API - DirectX 11.2 / OpenGl 4.3 / Mantle

R9 270X (previously the R7870 Ghz / Pitcairn)

• Stream Processors 1280
• Clock Frequency up-to 1.05 GHz
• 2.69 TFLOPS compute performance
• 2 or 4 GB memory at 5.6 Gbps
• 180W TDP
• PCI-E 3.0
• API - DirectX 11.2 / OpenGl 4.3 / Mantle

Respin much ?

Yes, much like NVIDIA has done with the 700 series AMD is doing something very similar. The R7 260X is a new GPU, but the R9 270/270X and R9-280X both are derivatives of the Pitcairn and Tahiti GPUs respectively. And who can remember Oland, that mobile GPU ? Well peek at the R7 250 specs, looks familiar right ? There are a number of changes though to be found in clock and memory frequencies so overall there will be slight performance increments. And much like NVIDIA does, AMD now implemented a 'Turbo' feature much like NVIDIA's boost technology on all of their products.
 

This means that there no longer is a fixed clock on these cards. The GPU clock will get a baseline and maximum frequency, in-between these two values the card will clock up/down based on power draw/limiters, performance and heat. In return the card will adaptive manage fan control, clock frequency and voltages (dynamic). AMD always has been much more reserved with the difference inbetween baseline and maximum frequency, so the difference in values won't be extremely big.

28nm Technology

The GPU architecture has remained the same though comparable towards the last-generation products, AMD still uses the 28nm process technology, the cards are PCIe gen 3 compatible and there have been significant changes on power consumption. We'll address all the features separately of course. With the launch of the R7 and R9 series you will also see Eyefinity updated towards version 2.0 DDM, audio is now fully supported (you hear audio on the actual monitor it's played off), the 5x1 landscape mode is introduced, and you may now create custom multi-monitor resolutions.
 

Interesting is that AMD now implemented next generation digital multipoint audio with smart channel splitting. So if you setup Eyefinity with three screens the six speakers in your monitors will now be configured as front left/mid/right channels. Very clever.
 

Eyefinity also has received a small update. You can now mix and match any monitor (similar monitors) output and create an Eyefinity setup. So if you have three of the same monitors you could hook up one towards HDMI, once to DVI and once to DP. That is the kind of flexibility we like a lot alright.

Um wait .. so the R9 270  is a Pitcairn / R7870 then ?

Yes, R9-270 is in fact the Radeon HD 7870 (Pitcairn aka the Bonaire graphics core) with its 2.8 Billion transistors, the internal architecture has not changed compared to the previous generation products, aside from memory and core clock frequencies. 

• The Radeon HD 7870 is packed with 1280 shader processors harbored in Compute Unit segments (20 of them). The board power is rated at 175W.
• The Radeon R9- 270 is packed with 1280 shader processors harbored in Compute Unit segments (20 of them). The board power is rated at 150W.

The Pitcairn GPU packs 2.8 billion transistors. Where the Radeon HD 7870 got a reference core clock frequency at a full GHz. The R9 270 runs (reference) boosted up-to 925 MHz. Obviously board partners are free to define faster factory clocks.