Diamond Radeon HD4850

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Diamond Radeon HD4850

July 7, 2008 by Lawrence Lee

Diamond Radeon HD 4850
PCI-E Video Card
Diamond Multimedia
Street Price

ATI's Radeon HD 3850/3870 brought a significant improvement to their discrete graphics card lineup. Not only did they perform well in 3D games, they were the first cards to support full hardware decoding for H.264 and VC-1 video. In addition, power efficiency was improved substantially — the HD 3850 for example used literally half the power of its predecessors on load, and almost four times less when idle. With the lower power draw, the amount of heat that required dissipating decreased proportionally, resulting in GPUs that were relatively easy to cool — even passively if an Accelero S1 was used to replace the stock cooler.

Fast-forward 8 months, and ATI's got a whole new batch of cards, this time the Radeon HD 4850 and 4870, utilizing the new RV770 core. These cards feature increased memory bandwidth, more stream processors and other improvements to make them competitive with nVidia's higher end offerings. Also, UVD has been slightly improved and the HDMI audio output supports 7.1 sound.

Presenting the Diamond Radeon HD 4850.

Today we're looking at Diamond Multimedia's version of the Radeon HD 4850. Diamond may be a new name to some, but they've been around since way back, producing PCI-E, AGP, PCI, and even ISA video cards based on nVidia or ATI GPUs (depending on the era). They currently also produce TV tuners and sound cards. The Diamond Radeon HD 4850 uses a cooling solution that looks virtually identical to the reference design, which is widely used by many card makers. This suggests that the acoustic and thermal performance of the Diamond can apply to a large number of Radeon HD 4850 cards in the marketplace.

Diamond's HD 4850 comes in rather flimsy black box.

Diamond Radeon HD 4850: Specifications
(from the product web page)
GPU HD 4850
ASIC Core RV 770
Core Clock 625
BUS PCI Express x16
Ports 2 Dual-Link DVI,Video Out [S-Video, Composite, HDTV]
Stream Processors 800
MFG Process 55nm fabrication process
Transistor Count 666 million transistors on 55nm fabrication proces
Cooling Active - FanCooler
Memory Clock 993
Memory Configuration 16Mx32
Memory Type GDDR3
Memory Bandwidth 147GB/sec
Memory Size 512MB
Memory Interface 256-bit
RAMDAC 400 Mhz
Video Quality
Cooling Active - FanCooler
Standard Slot Solution SINGLE
CrossFire CrossFire X
QuadFire Support YES
Direct-X 8.0-9.0-10.0-10.1
Open GL OpenGL 2.1
Vide Acceleration MPEG-2, MPEG-4, DivX, WMV9, VC-1, and H.264
Max Resolution Analog 1600 x 1200
Max Resolution Digital 2560 x 1600
HDR F.Point Rendering 128
HDR Integer 16-bit integer or floating point
Anti Aliasing Modes Smoothvision HD + Adaptive AA.Up to 24x Custom Filter Anti-Aliasing
Antisotropic Modes 2x/4x/8x/16x high quality adaptive anisotropic filtering modes (up to 128 taps per pixel)
Texture Support Texture filtering features 2x/4x/8x/16x high quality adaptive anisotropic filtering modes (up to 128 taps per pixel) 128-bit floating point HDR texture filtering Bicubic filtering sRGB filtering (gamma/degamma) Percentage Closer Filtering (PCF) Depth & stencil texture (DST) format support Shared exponent HDR (RGBE 9:9:9:5) texture format support
Pixel Operation TBA
Display Support
HDMI HDMI compliance / HDCP ready
Native Display Support 10-bit
3D Resolution 2560 x 1600
TV-OUT Resolution 720
Dual Display support Hydravision 4
Holywood Q.VIDEO Yes

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