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Gaming Performance Comparison
In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GT 620 are noticeably better than the Nvidia GeForce 8600 GT.
The GeForce GT 620 has a 160 MHz higher core clock speed and the same number of Texture Mapping Units as the GeForce 8600 GT. This results in the GeForce GT 620 providing 2.6 GTexel/s better texturing performance. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.
The GeForce GT 620 has a 160 MHz higher core clock speed than the GeForce 8600 GT, but the GeForce 8600 GT has 4 more Render Output Units than the GeForce GT 620. As a result, the GeForce 8600 GT exhibits a 1.5 GPixel/s better Pixel Fill Rate than the GeForce GT 620. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.
The GeForce GT 620 was released over three years more recently than the GeForce 8600 GT, and so the GeForce GT 620 is likely to have far better driver support, meaning it will be much more optimized and ultimately superior to the GeForce 8600 GT when running the latest games.
The GeForce GT 620 has 768 MB more video memory than the GeForce 8600 GT, so is likely to be much better at displaying game textures at higher resolutions. However, the overall memory performance is about the same.
The GeForce 8600 GT has 8 GB/sec greater memory bandwidth than the GeForce GT 620, which means that the memory performance of the GeForce 8600 GT is marginally better than the GeForce GT 620.
The GeForce GT 620 has 96 Shader Processing Units and the GeForce 8600 GT has 32. However, the actual shader performance of the GeForce GT 620 is 134 and the actual shader performance of the GeForce 8600 GT is 43. The GeForce GT 620 having 91 better shader performance is not particularly notable, as altogether the GeForce 8600 GT performs better when taking into account other relevant data.
The GeForce GT 620 transistor size technology is 40 nm (nanometers) smaller than the GeForce 8600 GT. This means that the GeForce GT 620 is expected to run much cooler and achieve higher clock frequencies than the GeForce 8600 GT. As they exhibit similar graphical performance, the GeForce GT 620 should consume less power than the GeForce 8600 GT.
The GeForce GT 620 requires 49 Watts to run and the GeForce 8600 GT requires 47 Watts. We would recommend a PSU with at least 300 Watts for the GeForce GT 620 and a PSU with at least 350 Watts for the GeForce 8600 GT. The GeForce GT 620 requires 2 Watts more than the GeForce 8600 GT to run. The difference is not significant enough for the GeForce GT 620 to have a noticeably larger impact on your yearly electricity bills than the GeForce 8600 GT.
|Mini Review||Overview |
GeForce GT 620 is an Entry-Level Graphics Card based on the first revision of the Fermi Architecture.
The Fermi Architecture is manufactured with a 40nm technology and uses a technique known as Hot Clocking: The Shaders are clocked twice as fast as the Central Unit. While this leads to a reasonable performance boost, it causes enormous amounts of energy dissipation, leading, ultimately, to a significantly higher operating temperature.
Fermi is also the first GPU architecture with fully cached memory access which increases memory performance.
It equips a GPU codenamed Fermi GF108-100-KB-A1 which has 2 Stream Multiprocessors activated and thus offers 96 Shader Processing Units, 16 TMUs and 4 ROPs. The Central Unit is clocked at 700MHz.
The GPU accesses a 1GB frame buffer of DDR3, through a 128-bit memory interface. The size of the frame buffer is exaggerated and in no way benefits the GPU. The Memory Clock Operates at 500MHz.
DirectX 11.0 Support (11.0 Hardware Default) and support for 3D Vision Surround, PhysX, Realtime Raytracing and other technologies.
The Cooling Solution consists of a Single-Fan.
With a rated board TDP of 49W, it requires at least a 300W PSU and it relies entirely on the PCI Slot for power, meaning no extra connectors are required.
Gaming benchmarks put its performance is somewhat better than Radeon HD 7470.
We recommend a modest processor (Intel Celeron) and 4GB of RAM for a system with GeForce GT 620.
|GeForce 8600 GT is a middle-class GFX based on the 80nm variant of the first-shader unified architecture. |
It's based on the G84 Core and offers 32 Shader Processing Units, 16 TMUs and 8 ROPs, on a 128-bit memory interface of GDDR3. The central unit runs at 540MHz and the memory clock operates at 700MHz. It will consume no more than 47 Watt.
It performs much better, when compared to GeForce 8600 GS, thanks to the extra Shading Units and remains within the same power envelope (47 Watt) due to being equipped with GDDR3 (against 8600 GS's DDR2).
This GPU is only suited for a 1024x768 (or less) resolution. Some of today's games will run at medium settings although extremely demanding games might not run at all. DirectX 11 based games aren't supported and its performance will decrease drastically, as the resolution increases.