ATI Radeon HD 4670 Video Card Review :: ATI Radeon HD 4670 Features

09-16-2008 · Category: Hardware - Video Cards

By Ben Sun
  • 320 SPs
  • 128-bit memory interface
  • 55 nanometer process
  • 514 million transistors
  • 4x AA samples 8
  • Z/Stencil 32
  • Textures 32
  • Memory Bandwidth 32GB/Sedionc
  • Terascale graphics engine
  • DirectX 10.1 Suppots
  • Pixel Shader 4.1
  • Vertex Shader 4.1
  • UVD2
  • $79 USD
  • 512MB GDDR3 memory
  • Unified Video Decoder 2


ATI Radeon HD 4670 Video Card Review

Brand NameATI
Part NumberHD 4670
Graphics ChipRV 730
Core clock750MHz
Shader Clock750MHz
SPs320
Fabrication Process55 nm
Transistors514 Million
Memory clock2000MHz
Memory Interface128-bit
Memory bandwidth32GB/second
Memory Size512MB
ROPs16
Texture Filtering Units32
Texture Filtering Rate16 Gigatexels/second
HDCP SupportYes
HDMI SupportYes (via adapter)
ConnectorsDual DisplayPort, DVI, TV-Out
RAMDACs400MHz
Bus PCI Express 2.0
Form FactorSingle Slot
Power Connectors N/A

The HD 4670 is based upon ATIís RV730 chip which is based upon TSMCís 55 nanometer process and has 514 million transistors and a die size of 146mm2. The HD 4670 has 320 Stream Processors which is the same number as the last generation enthusiast cards from ATI, the HD 3870 cards. In point of fact, the HD 4670 has nearly doubled the transistor count on a die size under 20% bigger than the previous generation.

The RV730 chip has half the number of SP cores per SIMD core, 40 instead of 80, with 8 SIMD cores in the chip for a total of 320 Stream Processors that the RV770 chip had which is the basis for the HD 4870 cards. The HD 4670 has double the texture filtering units that the previous generation high-end HD 3870 had and four times that of the HD 3650 cards in the form of 32 texture filtering units.


ATI Radeon HD 4670 Video Card Review Crossfire bridge

Crossfire bridge


ATI calls their multiple graphics card solution CrossfireX. The advantages CrossfireX has over the competing solution from NVIDIA are that it can be enabled on non-ATI boards, while the majority of the boards that support SLI cannot use Crossfire and the ability to Crossfire up to four single slot video cards, meaning that four 4870s can be used together in Crossfire mode.

ATI has been pushing the features of DirectX 10.1 since they started supporting the new API a year ago with the HD 3870. The previous generation sub-$100 video cards, the HD 3650 supported 10.1, but it is with the launch of the HD 4650 that the performance of the sub-$100 video cards brings HD 3870 performance to the under $100 price range that those features really become useful to the video card consumer. After all, why would someone buy a video card to support the latest features if the features are not useable?

ATI has updated their Universal Video Decoder 2 which first came into being with the ATI HD 2900XT cards a couple of years back with their second generation UVD2. The new version has the ability to have two simultaneous HD streams streaming at once, for example, playing a Blu-Ray movie while watching the Directorís Commentary in the PiP (Picture in Picture) mode. The ATI HD 4000 series was ATIís first to support Avivo HD automatic and dynamic contrast adjustment. The HD 4600 series are the first ATI cards to support integrated 8-channel audio for both HDMI and DisplayPort.

Hereís a chart showing the current lineup of NVIDIA based and ATI based video cards. As you can see there is a large amount of overlap between cards that are not meant to compete against each other but will due to the ever-changing nature of the video card industry. ATI and NVIDIA would argue that comparing cards with similar pricing may be unfair, but the reality is the consumer looks at the price and performance of the video cards and while some might impose a hard cap on their purchasing others might look at the value spending a few more dollars to get significantly more performance for the money.


GPUCore clockShader clockSPsMemory clock Memory bus Memory bandwidth Memory Price online 9/01/08
GeForce GTX 280 60212962401107512-bit141.7GB/second1GB GDDR3 439
Geforce GTX 260 576 1242 192 1000 448-bit 112GB/second 896MB GDDR3 249.99
GeForce 9800GTX+ 738 1836 128 1100 256-bit 70.4GB/second 512MB GDDR3 199.99
GeForce 9800GTX 675 1688 128 1100 256-bit 70.4GB/second 512MB GDDR3 199.99
GeForce 9800GT 600 1500 112 900 256-bit 57.6GB/second 512MB GDDR3 142.99
Palit GeForce 9800GT Super+ 1GB 600 1500 112 900 256-bit 57.6GB/second 1024MB GDDR3 169.99
9600GT 650 1625 64 900 256-bit 57.6GB/second 512MB 95
9600GSO 550 1375 96 800 192-bit 38.4GB/second 384MB 90
9500GT 550 1400 32 800 128-bit 25.6GB/second 512MB 70
9400GT 550 1400 16 400 128-bit 12.8GB/second 512MB 60
ATI Radeon HD 4870 X2 750 750 800x2 1800 256-bitx2 GDDR5 230.4GB/second 2GB GDDR5 549.99
HD 4870 750 750 800 1800 256-bit GDDR5 115.2GB/second 512MB 279.99
HD 4850 625 625 800 1986 256-bit GDDR3 63.6GB/Second 512MB 170.00
HD 3870 X2 825 825 640 1800 256-bitx2 GDDR3 115.2GB/second 512MB X2 GDDR3220
HD 3870 775 775 320 1800 256-bit 57.6GB/second 512MB GDDR3 125
HD 4670 750 750 320 2000 128-bit 32GB/second 512MB GDDR3 80
HD 4650 600 600 320 1000 128-bit 16.6GB/second 512MB70
HD 3850 668 668 320 1656 256-bit 53GB/second 512MB GDDR3 89.99
HD 3650 720 720 120 800 128-bit 256GB/second 512MB GDDR3 55.99
HD 3450600 600 40 800 64-bit 12.8GB/second 256MB GDDR2 44.99

One thing that has improved greatly since the release of the Radeon 8500 was the driver situation at ATI. ATI now releases a new official WHQL driver 12 times a year. One consequence of this is that they are much more likely to fix a problem with drivers faster than their competition who releases drivers on a much more random schedule. ATI Catalyst drivers control the various settings of the new video card. One oddity was that when the HD 4670 was installed it was called an ATI Radeon Graphics Processor. I was able to overclock the card to 790MHz/1040MHz core/memory with the Overdrive utility found in the driverís page.


ATI Drivers


ATI Radeon HD 4670 Video Card Review
ATI Radeon HD 4670 Video Card Review
ATI Radeon HD 4670 Video Card Review
ATI Radeon HD 4670 Video Card Review


ATI Radeon HD 4670 Video Card Review
ATI Radeon HD 4670 Video Card Review
ATI Radeon HD 4670 Video Card Review