Asus/PowerColor/Sapphire Radeon HD 4890 Review --- TheThirdMedia Hardware

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Folks familiar with Kanye West's music should by now have a pretty good idea of what ATI's new Radeon HD 4890 (HD 4890) is all about. But for those who don't, it is quite literally, as the lyrics go, a pumped up, beefed up version of the Radeon HD 4870. Think of it as a HD 4870 that has taken a steroid or two and has undergone many hours of intensive weight-training.

Since the release of the Radeon HD 4830, ATI has been fairly quiet on the GPU scene. And in between then and now, NVIDIA has released a slew of new SKUs. To be fair, most of them are rehashed products, but the super-fast GeForce GTX 295 and GeForce GTX 285 were two particularly outstanding SKUs that managed to put NVIDIA back in the limelight. In fact, word on the street is that NVIDIA has another high-end SKU up their sleeves and is finding ways to slim it down and improve their massive GTX 295.

It's time ATI fought back and the HD 4890 is their response. It is ATI's latest flagship GPU, but it still retains the 55nm core and 800 stream processors from the HD 4870. Happily, clock speeds have been bumped up. The core now clocks in at 850MHz, whereas the memory is now doing a stratospheric 3900MHz DDR. This is up from the HD 4870's 750MHz at the core and 3600MHz DDR at the memory.

To accommodate these massive increases in clock speeds, ATI has redesigned the core by adding decoupling capacitors to reduce signal noise. The company has also re-timed the chip and altered the chip's power distribution. Thanks to this new design, ATI claims that most boards tested in their labs were able to achieve clock speeds of 950MHz at the core and 4300MHz DDR at the memory. We'll definitely be putting this claim to the test.

In any case, we are expecting the HD 4890 to significantly outperform the older HD 4870. With that, we must now put the HD 4890 to the test to see if it is really any better, faster and stronger. But first, a quick look at its technical specifications and how it stacks up against comparable competitive SKUs.

Our three Radeon HD 4890 cards stacked neatly. Without their stickers on, even "Photo Hunt" experts will have difficulty trying to spot the differences between them.

The Radeon HD 4890 and Competitive SKUs
GTX260 Core216

Model	ATI Radeon HD 4890 1GB	ATIRadeonHD 4870 512MB	ATIRadeonHD 4850 512MB	NVIDIAGeForce GTX 260 Core 216 896MB	NVIDIAGeForce GTX 285 1GB
CoreCode	RV790	RV770	RV770	GT200	GT200
TransistorCount	959million	956million	956million	1400million	1400million
ManufacturingProcess	55nm	55nm	55nm	65nm	55nm
CoreClock	850MHz	750MHz	625MHz	576MHz	648MHz
StreamProcessors	800Stream processing units	800Stream processing units	800Stream processing units	216Stream Processors	240Stream Processors
StreamProcessor Clock	850MHz	750MHz	625MHz	1242MHz	1476MHz
TextureMapping Units (TMU) or Texture Filtering (TF)units	40	40	40	72	80
RasterOperator units (ROP)	16	16	16	28	32
MemoryClock	3900MHzGDDR5	3600MHzGDDR5	2000MHzGDDR3	1998MHzGDDR3	2484MHzGDDR3
DDRMemory Bus	256-bit	256-bit	256-bit	448-bit	512-bit
MemoryBandwidth	124.8GB/s	115.2GB/s	64GB/s	111.9GB/s	159GB/s
PCIExpress Interface	PCIever 2.0 x16	PCIever 2.0 x16	PCIever 2.0 x16	PCIever 2.0 x16	PCIever 2.0 x16
MolexPower Connectors	2 x6-pin	2 x6-pin	6-pin	2 x6-pin	2 x6-pin
MultiGPU Technology	CrossFireX	CrossFireX	CrossFireX	SLI	SLI
DVIOutput Support	2 xDual-Link	2 xDual-Link	2 xDual-Link	2 xDual-Link	2 xDual-Link
HDCPOutput Support	Yes	Yes	Yes	Yes	Yes
StreetPrice	US$260	~US$219	~US$159	~US$229	~US$359



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