MSI Radeon 4850 R4850-V101 Video Card Review :: MSI Radeon 4850 R4850-V101 Features

09-05-2008 · Category: Hardware - Video Cards

By Ben Sun
  • 55 nanometer
  • 956 million transistors
  • RV770 chip
  • 625MHz core clock
  • 1986MHz memory clock
  • GDDR3 Memory
  • 256-bit memory interface
  • 63.6GB/second memory bandwidth
  • 16 ROPS
  • 800 Stream Processors
  • 32 Texture units
  • DirectX 10.1
  • Pixel Shader 4.1
  • Vertex Shader 4.1
  • Unified Video Decoder
  • AVIVO
  • Quad Heatpipe cooling solution


MSI Radeon 4850 R4850-V101 Video Card Review

Brand NameGigabyte
Part NumberR4850 512M
Graphics ChipRV 770 Pro
Core clock625MHz
Shader Clock625MHz
SPs800
Fabrication Process55 nm
Transistors956 Million
Memory cloick1.986GHz effective
Memory Interface256-bit
Memory bandwidth63.6GB/second
Memory Size512MB
ROPs16
Texture Filtering Units32
Texture Filtering Rate20 Gigatexels/second
HDCP SupportYes
HDMI SupportYes (via adapter)
Connectors2x Dual-Link DVI, TV-Out
RAMDACs400MHz
Bus PCI Express 2.0
Form FactorDual Slot
Power Connectors 1x 6-pin

The MSI Radeon 4850 card is based upon ATIís RV770 Pro chip which is built on 55 nanometer process from TSMC and has 956 million transistors. The chip is the same as the RV770XT chip found on the HD 4870 cards with the exception of having a slower clock speed, 625MHz compared to the 750MHz on the HD 4870 cards and the use of GDDR3 memory instead of GDDR5 on the HD 4870 card.

The RV770 Pro chip has 160 execution units each of which is capable of running a 5D operation in a single clock. This leads to ATIís claims of 800 Stream Processors on the HD 4850 card and the card is capable of 1 TeraFLOP of computing performance. The HD 4850 has 32 texture units and 32 ROPs (Outputted Pixels) meaning that it has a pixel fill rate of 10 Gigapixels a second and a texel fill rate of 20 Gigatexels a second.

Microsoft has begun talking about the next iteration of their graphics API (Application Programming Interface), DirectX 11 at Siggraph and nVision, NVIDIAís marketing term for their graphics related conference. The current state-of-the art is DirectX 10.1 which ATI was the first graphics card company to support with the HD 3870 launch last year. The HD 4850 and 4870 both support this API which adds support for Global Illumination and more features to the Anti-aliasing modes of video cards.

The 4850 has a 256-bit memory interface with GDDR3 memory clocked at 1986MHz. This gives an effective memory bandwidth of 63.6GB/second. The use of GDDR5 memory on the bigger brother 4870 card is gives that card 115.2GB/second memory bandwidth. One thing that the card has going for it that the earlier video cards of this generation is the lack of a ring bus that was present on the HD 3xxx series. This card is targeted to the under $200 video card market and that market is using the 256-bit memory bus.