HIS Radeon HD 7750 iCooler review
Posted by Hilbert Hagedoorn on: 02/15/2012 02:00 PM [ 0 comment(s) ]
The Graphics engine architecture
With the initial release of the 7900 series AMD moved away from the VLIW5 and VLIW4 architecture we have seen in the last generation of products. If anything, VLIW4 has shown certain inefficiencies in the Radeon HD 6900 series and while VLIW designs are fine for graphics they are not so grand for computing.
The Radeon HD 7700 series is also based on the GCN architecture.
GCN is short for Graphics Core Next architecture and the architecture building block has changed significantly to remove certain inefficiencies seen in the VLIW architecture.
A GCN in essence is the basis of a GPU that performs well at both graphical and computing tasks. For the compute side of things the new GCN Compute unit model has been introduced, it is designed for better utilization, high throughput and multi tasking, e.g. performance, performance, performance.
So your basic new Shader cluster is one called a (GCN) Compute Unit:
- Non-VLIW Design
- 16 wide SIMD units
- 64 KB registers / SIMD unit
Now if we take 4 of these SIMD units that will be the basis of one Compute Unit (CU), each SIMD unit is 16 wide, times four per compute unit means that each CU has 64 shader processors.
The Cape Verde GPU has 10 Compute Units meaning 64SIMDs x 10 CUs = 640 Shader processors (for the R7770).
- Engine has Dual Geometry engines / Asynchronous Compute engines
- 32 color ROPs per clock cycle
- Engine ties to 512KB R/W L2 cache
- Cape Verde GPU has up-to 10 Compute Units
The Graphics Core Next Compute Unit (CU) has about the same floating point power per clock as the previous one (i.e. Cayman). It also has the same amount of register space (for the vector units). Each CU also has its own registers and local data share.
GCN is more efficient since it does not require instruction level parallelism (we assume it costs some more area/transistors as well). The outcome, compiling also becomes much more uncomplicated and that means more efficiency and thus there it is again, better performance. GCN is all about creating a GPU good for both graphics and computing purposes.
We test and review the a HIS Radeon HD 7950 HIS IceQ X, this 30 CM sized beast is one heck of a graphics card. Custom PCB, custom cooling, it's low noise and being a Boost edition card series, it clocks in at 950 MHz.
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HIS Radeon HD 7950 ICEQ Turbo review
We review the HIS Radeon HD 7950 IceQX Turbo. The product comes factory overclocked very nicely for you as it is running a gentle 900 MHz clock frequency. HIS uses a custom PCB and dual-slot cooler making the card very easy to install. Despite that factory overclock and that cooler the noise levels remain at very low levels whereas the GPU temperatures remain downright excellent as we'll show you in this review.