ASUS EN9800GT HybridPower Video Card Review :: ASUS EN9800GT HybridPower Features

11-28-2008 · Category: Hardware -

By Ben Sun
  • 112 Stream Processors
  • 600MHz core clock speed
  • 1800MHz memory clock speed
  • 1500MHz Shader Clock
  • 16 ROPs
  • 256-bit memory bus
  • 57.6GB/second memory bandwidth
  • DirectX 10.0
  • Pixel Shader 4.0
  • Vertex Shader 4.0
  • Geometry Shaders
  • PhysX
  • PureVideo HD
  • CUDA


ASUS EN9800GT HybridPower Video Card Review

Brand Name ASUS
Part Number EN9800GT HB/HDTI/D/A
Graphics Chip G92
Core clock 600
Shader Clock 1500
SPs 112
Fabrication Process 65 nanometer
Transistors 754 Million
Memory clock 1.8GHz
Memory Interface 256-bit
Memory bandwidth 57.6GB/second
Memory Size 512MB
ROPs 16
Texture Filtering Units 32
Texture Filtering Rate 33.6 Gigatexels/second
HDCP Support Yes
HDMI Support Yes (via adapter)
Connectors 2x Dual-Link DVI, TV-Out
RAMDACs 400MHz
Bus PCI Express 2.0
Form Factor Dual Slot
Power Connectors 1x6-pin

The specifications of the GeForce 9800GT might seem familiar to anyone with an NVIDIA video card of the last year or so. That is because the chip is based upon the same G92 chip that the GeForce 8800GT was built upon with the addition of a few non-graphic features. The main new features of the GeForce 9800GT are HybridPower, HDMI Output and PureVideo HD support that is found on the 9xxx cards not found on the 8xxx cards.

The 9800GT has 112 Stream Processors, which is exactly the same as the first 8800GT cards With a clock speed of 600MHz for the core this means the card has a fill rate of 33.6Gigatexels/second. In fact the clock speeds of the Core Memory and Shader speeds are exactly the same as the 8800GT cards. The memory clock is 1800MHz (900MHz GDDR3) which gives a memory bandwidth of 57.6GB/second.

HybridPower is NVIDIA's nomenclature for their power saving technology that when used in combination with a NVIDIA motherboard can save power. ASUS in fact uses HybridPower on the name of their card, meaning that it is supported. What HybridPower does is turn off the discrete graphics card ala the 9800GT card when 2D mode is enabled. Only motherboards with NVIDIA integrated 8200 or 9300/9400 graphics support this feature. As the maximum power of a graphics card can exceed 226W (GTX 280), this is a great way of saving energy.

PureVideo HD is the latest incarnation of PureVideo released by NVIDIA. It is both hardware and a software decoder/encoder. PureVideo HD adds Dynamic Contrast Enhancement and Dual HD Streaming capability to the engine. It was first introduced with the 9600GT cards last year. PureVideo HD allows for the changing of the contrast in a picture on the fly. The other feature allows the user to play back two High Definition streams simultaneously, meaning that the video card can play back both the cast commentary and the main movie at the same time.

One of NVIDIA's big pushes recently has been their push of CUDA and PhysX technologies. CUDA allows the graphics card to operate as a computer with the 9800GT having 112 Stream Processors that can work either as a Compute processor or as a graphics Processor. NVIDIA cards based upon 8xxx series or 9xxx series chips can run PhysX games like Unreal Tournament 3, Warmonger and the recently announced Mirror's Edge which will support PhysX effects to good effect.