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Gaming Performance Comparison

In terms of overall gaming performance, the graphical capabilities of the AMD Radeon R9 270 are massively better than the Nvidia GeForce GTX 645 (OEM).

The Radeon R9 270 has a 77 MHz higher core clock speed and 32 more Texture Mapping Units than the GTX 645. This results in the Radeon R9 270 providing 32.5 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 Radeon R9 270 has a 77 MHz higher core clock speed and 16 more Render Output Units than the GTX 645. This results in the Radeon R9 270 providing 15.6 GPixel/s better pixeling performance. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

The Radeon R9 270 was released less than a year after the GTX 645, and so they are likely to have similar driver support for optimizing performance when running the latest games.

The Radeon R9 270 has 1024 MB more video memory than the GTX 645, so is likely to be much better at displaying game textures at higher resolutions. This is supported by the fact that the Radeon R9 270 also has superior memory performance overall.

The Radeon R9 270 has 115.2 GB/sec greater memory bandwidth than the GTX 645, which means that the memory performance of the Radeon R9 270 is massively better than the GTX 645.

The Radeon R9 270 has 1280 Shader Processing Units and the GeForce GTX 645 (OEM) has 576. However, the actual shader performance of the Radeon R9 270 is 1066 and the actual shader performance of the GTX 645 is 511. The Radeon R9 270 having 555 better shader performance and an altogether better performance when taking into account other relevant data means that the Radeon R9 270 delivers a massively smoother and more efficient experience when processing graphical data than the GTX 645.

The Radeon R9 270 requires 150 Watts to run and the GeForce GTX 645 (OEM) requires 65 Watts. We would recommend a PSU with at least 500 Watts for the Radeon R9 270 and a PSU with at least 450 Watts for the GTX 645. The Radeon R9 270 requires 85 Watts more than the GTX 645 to run. The difference is significant enough that the Radeon R9 270 may have an adverse affect on your yearly electricity bills in comparison to the GTX 645.

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GPU Core Details

Core Speed900 MHzvs823 MHz
ArchitectureGCN 1.1 Curacao PROKepler GK106
Notebook GPUnono
SLI/Crossfireyesvsno
Dedicatedyesvsyes
Release Date13 Nov 201322 Apr 2013
GPU LinkGD LinkGD Link
Approved
Comparison

Resolution Performance

1366x768
10
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1600x900
10
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1920x1080
8.1
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2560x1440
7.2
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3840x2160 - green tick vs green tick -

GPU Memory

Memory2048 MBvs1024 MB
Memory Speed1400 MHzvs1000 MHz
Memory Bus256 Bitvs128 Bit
Memory TypeGDDR5vsGDDR5
Memory Bandwidth179.2GB/secvs64GB/sec
L2 Cache 512 KB green tick vs 384 KB
Comparison

GPU Display

Shader Processing Units1280vs576
Actual Shader Performance1066vs511
Technology28nmvs28nm
Texture Mapping Units80vs48
Texture Rate72 GTexel/svs39.5 GTexel/s
Render Output Units32vs16
Pixel Rate28.8 GPixel/svs13.2 GPixel/s
Comparison

GPU Display Tech

DirectX11.2vs11.1
Shader Model5.0vs5.0
Open GL4.3vs4.3
Max Resolution (WxH)4096x2160vs4096x2160
VGA Connections0vs0
DVI Connections2vs2
HDMI Connections1vs1
Comparison

GPU Power Requirements

Max Power150 Wattsvs65 Watts

GPU Supporting Hardware

Recommended RAM8 GBvs8 GB
Recommended Screen Size1920x10801600x900
Recommended PSU500 Watts & 32 Ampsvs450 Watts & 30 Amps

Gaming Performance Value

Performance Value

GPU Mini Review

Mini ReviewRadeon R9 270 is a fast-middle-class graphics card based on the Curacao PRO of the GCN architecture.
The Curacao PRO Core is a redesign of the Pitcairn XT Core used on Radeon HD 7870. It offers 1280 Shader Processing Units, 80 TMUs and 32 ROPs, on a 256-bit memory interface but has support for DirectX 11.2 and AMD's PowerTune technology.
Furthermore when compared to Radeon HD 7870, Radeon R9 270 comes with a central unit clocked at 900MHz and goes up to 925MHz while its operating memory clock is of 1400MHz. As a result, the card offers extra bandwidth but has a superior TDP.
Benchmarks indicate its performance is comparable to Radeon HD 7870.
GeForce GTX 645 (OEM) is a fast-middle-class Graphics Card based on the 28nm, Kepler architecture.
Set to replace the already released, in 2012, Fermi based, GeForce GT 645, it equips a Kepler GK106 Core with 576 Shader Processing Units, 48 TMUs and 16 ROPs, on a 128-bit memory interface of fast GDDR5. The central unit runs at 823MHz (up to 888MHz, in Turbo Mode) and the memory clock operates at 1000MHz.
Benchmarks indicate its performance is only very slightly below next-in-series GeForce GTX 650, because despite featuring one extra SMx activated, GeForce GTX 650 is higher-clocked and offers more bandwidth.
Recommended CPUAMD Phenom II X4 805
AMD Phenom II X4 905e
Intel Pentium G2130 3.2GHz
Intel Xeon Processor X3370
Intel Core 2 Extreme QX6700 2.66GHz
AMD FX-4300
Intel Core 2 Quad Q9550S 2.83GHz
Intel Core 2 Quad Q9550 2.83GHz
AMD Phenom II X4 960T
Intel Core i3-4360T 3.2GHz
Possible GPU Upgrades--
GPU VariantsRadeon R9 270 HIS iCooler 2GB Edition
Radeon R9 270 HIS IceQ X² 2GB Edition
Radeon R9 270 Sapphire Dual-X 2GB OC Edition
Radeon R9 270 PowerColor 2GB OC Edition
Radeon R9 270 Club3D royalQueen Edition
Radeon R9 270 HIS IceQ X² Turbo Edition
Radeon R9 270 DirectCU II OC Edition
Radeon R9 270 Gigabyte WindForce 2X OC Edition
Radeon R9 270 MSI Gaming 2GB Edition
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