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Gaming Performance Comparison

In terms of overall gaming performance, the graphical capabilities of the AMD Radeon HD 4850 are very slightly better than the AMD Radeon HD 6670 Sapphire 1GB GDDR5.

The HD 6670 has a 175 MHz higher core clock speed than the Radeon HD 4850, but the Radeon HD 4850 has 16 more Texture Mapping Units than the HD 6670. As a result, the Radeon HD 4850 exhibits a 5.8 GTexel/s better Texture Fill Rate than the HD 6670. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.

The HD 6670 has a 175 MHz higher core clock speed than the Radeon HD 4850, but the Radeon HD 4850 has 8 more Render Output Units than the HD 6670. As a result, the Radeon HD 4850 exhibits a 3.6 GPixel/s better Pixel Fill Rate than the HD 6670. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

The HD 6670 was released over three years more recently than the Radeon HD 4850, and so the HD 6670 is likely to have far better driver support, meaning it will be much more optimized and ultimately superior to the Radeon HD 4850 when running the latest games.

The HD 6670 has 512 MB more video memory than the Radeon HD 4850, so is likely to be much better at displaying game textures at higher resolutions. This is supported by the fact that the HD 6670 also has superior memory performance overall.

The HD 6670 has 0.4 GB/sec greater memory bandwidth than the Radeon HD 4850, which means that the memory performance of the HD 6670 is marginally better than the Radeon HD 4850.

The Radeon HD 6670 Sapphire 1GB GDDR5 has 480 Shader Processing Units and the Radeon HD 4850 has 800. However, the actual shader performance of the HD 6670 is 211 and the actual shader performance of the Radeon HD 4850 is 325. The Radeon HD 4850 having 114 better shader performance and an altogether better performance when taking into account other relevant data means that the Radeon HD 4850 delivers a marginally smoother and more efficient experience when processing graphical data than the HD 6670.

The HD 6670 transistor size technology is 15 nm (nanometers) smaller than the Radeon HD 4850. This means that the HD 6670 is expected to run slightly cooler and achieve higher clock frequencies than the Radeon HD 4850. As they exhibit similar graphical performance, the HD 6670 should consume less power than the Radeon HD 4850.

The Radeon HD 6670 Sapphire 1GB GDDR5 requires 75 Watts to run and the Radeon HD 4850 requires 110 Watts. We would recommend a PSU with at least 400 Watts for the HD 6670 and a PSU with at least 450 Watts for the Radeon HD 4850. The Radeon HD 4850 requires 35 Watts more than the HD 6670 to run. The difference is significant enough that the Radeon HD 4850 may have a slight adverse affect on your yearly electricity bills in comparison to the HD 6670.

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GPU Core Details

Core Speed800 MHzvs625 MHz
ArchitectureTerascale 2 Turks XTRV770 PRO
Notebook GPUnono
SLI/Crossfireyesvsyes
Dedicatedyesvsyes
Release Date01 Dec 201101 Jun 2008
GPU LinkGD LinkGD Link
Approved
Comparison

GPU Memory

Memory1024 MBvs512 MB
Memory Speed1000 MHzvs993 MHz
Memory Bus128 Bitvs256 Bit
Memory TypeGDDR5vsGDDR3
Memory Bandwidth64GB/secvs63.6GB/sec
L2 Cache 256 KB green tick vs -
Comparison

GPU Display

Shader Processing Units480vs800
Actual Shader Performance211vs325
Technology40nmvs55nm
Texture Mapping Units24vs40
Texture Rate19.2 GTexel/svs25 GTexel/s
Render Output Units8vs16
Pixel Rate6.4 GPixel/svs10 GPixel/s
Comparison

GPU Display Tech

DirectX11vs10.1
Shader Model5.0vs4.1
Open GL4.1vs3.2
Max Resolution (WxH)2560x1600vs2560x1600
VGA Connections1vs0
DVI Connections1vs2
HDMI Connections1vs0
Comparison

GPU Power Requirements

Max Power75 Wattsvs110 Watts

GPU Supporting Hardware

Recommended RAM6 GBvs6 GB
Recommended Screen Size1440x9001440x900
Recommended PSU400 Wattsvs450 Watts & 30 Amps

Gaming Performance Value

Assassins Creed: Brotherhoodvs
Dirt 3vs
Crysis 2vs
Assassins Creed: Revelationsvs
Batman: Arkham Cityvs
Performance Value

GPU Mini Review

Mini ReviewRadeon HD 6670 Sapphire 1GB GDDR5 is a reference Radeon HD 6670 with a new cooling system that delivers exactly the same performance but operates more silently and generates less heat.Radeon HD 4850 is a high-end GFX based on the 55nm, third unified shader architecture, R700.
It's based on the RV770 PRO Core and offers 800 Shader Processing Units, 40 TMUs and 16 ROPs a 256-bit memory interface of standard GDDR3. The central unit runs at 625MHz and the memory clock runs at up to 993MHz.
Some of today's modern games should run fluently at high settings but with modest resolutions. DirectX 11 games aren't supported.
Recommended CPUIntel Celeron E3400 Dual-Core 2.6GHz
AMD Opteron 8222
AMD Opteron 8222 SE
AMD Opteron 1222 SE
Intel Pentium Dual Core E6300 2.8GHz
Intel Pentium G850 2.9GHz
Intel Pentium G645 2.9GHz
AMD Phenom 9600 Quad-Core Black Edition
AMD Phenom 9600B Quad-Core
AMD Phenom 9600 Quad-Core
Possible GPU UpgradesRadeon HD 7850 XFX DD Black Edition
Radeon HD 7850 Club3D royalAce Edition
Radeon HD 7850 Direct CU II TOP
GeForce GTX 650 Ti Boost Palit OC 2GB Edition
GeForce GTX 650 Ti Boost DirectCU II OC Edition
GeForce GTX 750 Ti MSI OC v1 2GB Edition
GeForce GTX 750 Ti MSI OC 2GB Edition
GeForce GTX 750 Ti Galaxy OC 2GB Edition
GeForce GTX 750 Ti Asus OC 2GB Edition
GeForce GTX 750 Ti EVGA W/ ACX 2GB Edition
GPU Variants-Radeon HD 4850 Sapphire DP 512MB GDDR3
Radeon HD 4850 Gigabyte 512MB Edition
Radeon HD 4850 Sapphire 1GB GDDR3
Radeon HD 4850 Gigabyte OC Edition
Radeon HD 4850 Golden Sample Edition
Radeon HD 4850x2