You've been hearing several codenames flying around and that can be a little confusing as we always do, let's explain that first. It's simple really, in the market we have entry level, mainstream and high-end products. When you notice "Cape Verde" that's the entry level Radeon HD 7700. Next in line is "Pitcairn" which is the codename of AMDs the mainstream products and thus the series 7800 tested today. Finally there's "Tahiti" which is the codename for the GPU used in the most high-end products.
Entry level = Cape Verde = Radeon HD 7700 series
Mainstream level = Pitcairn = Radeon HD 7800 series
High-end level = Tahiti = Radeon HD 7900 series
The entire segment from top to bottom is now released in Q1 2012, the 28nm stack has been filled. We do expect to see some respins and slightly different SKUs over time, but basically this is the entire lineup. That said, of course a dual-GPU based Tahiti graphics card is still pending launch. We shall name that Radeon HD 7990 for now.
It is important to understand that there are significant changes in this family of GPUs. The GPU architecture was overhauled, AMD moved towards a 28nm process technology, the new cards are all PCIe gen 3 compatible and there have been significant changes on power consumption. We'll address all these features separately of course.
With the launch of the Radeon HD 7000 series Eyefinity has been updated to version 2.0. DDM audio is now fully supported (you hear audio on the actual monitor it's played on), a new 5x1 landscape mode is introduced, and you may now create custom multi-monitor resolutions.
Radeon HD series 7800
We start off with the GPU overview. AMD now bakes GPUs on the all new 28nm node, in very simple wording that means they can put more transistors on a smaller processor die area, typically resulting in less power consumption as well.
The Radeon HD 7800 Pitcairn graphics core has agood 2.8 Billion transistors, the internal architecture has changed compared to the previous generation products, we'll talk a little deeper about that in a minute, but as a result:
The Radeon HD 7850 is packed with 1024 shader processors harbored in Compute Unit segments (16 of them). The board power is rated at 130W, the actual TDP will be a little lower as we'll demonstrate later on.
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 actual TDP will be a little lower as we'll demonstrate later on.
Memory wise both cards in it's reference design will pack 2 Gigabyte of DDR5 memory, quite a bit for mainstream level products. The memory bus is 256-bit, but combined with the gDDR5 memory (which is quad data rate) you do get a decent chunk of much needed memory bandwidth, which the GPU certainly can use. The memory clock will be 1200 MHz on both products, being quad data-rate (gDDR5) that results in an effective data rate of 4800 MHz or 4.8 GHz. This will give the Pitcairn GPUs 154 GB/sec of framebuffer bandwidth to do its thing in.
The Pitcairn GPU packs 2.8 billion transistors, but if you can't apply a fast enough clock frequency it would become a problem. Well, that's not an issue for AMD either, the R7850 is clocked at 860 MHz while the Radeon HD 7870 will get a reference core clock frequency at a full GHz.
AMD Radeon R9-295x2 Review Join us, as we review the Radeon R9-295 x2 with 8GB graphics memory. The Radeon R9-295 x2 is a dual-GPU based graphics card the comes with two Hawaii XT GPUs, these two GPU's are fully enabled on al...
AMD Radeon R7-265 Review We review the AMD Radeon R7-265 today, the card is being injected into AMDs line-up of affordable graphics cards to be able to compete with NVIDIAs new 750 series. That means 1080P gaming will become...
Guru3D Contest 2013 - Win an AMD Radeon R9 290X It's Christmas week 2013 and that traditionally means we start-up contests here at Guru3D.com This year we have three competititions and in this specific one you will be on a queste to win an AMD Rad...
AMD Radeon R7-260 review Today we'll review the AMD Radeon R7-260, a budget brother of the 260X. The Radeon R7 260 is fitted with a Curacao Pro core which has cut down specifications with a total of 768 Stream processors, a compute performance of 1.54 TFlops, 1 GB of GDDR5 memory and a low TDP of 95W which will be supplied through a single 6-Pin power connector. Clocks are set at 1.0 GHz for the core while the memory operates at 6.0 GHz effective clock speed aside a 128-bit memory interface. The card is PCI-Express 3.0 compatible.