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| Overclocking Results: |
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The
Asus EAH4850 HTDI/512M/A videocard ships with its R770 GPU running at a default
clock speed of 625MHz GPU. The 512MB of DDR3 memory runs at 1000Mhz (2000Mhz
DDR). AMD makes overclocking its videocards pretty fun, well ever since the
release of ATI Overdrive. PCSTATS' experience when overclocking the Radeon HD
3870 X2 was mixed, so perhaps this single GPU Radeon HD 4850 will yield much
better overclocking results.... it is an ASUS videocard
after all!
As usual, overclocking was done through the ATI Catalyst Control Center and
ATI Overdrive which unlocks GPU and memory clock speed. PCSTATS started with the
GPU first, pausing to test the results with a quick 3D benchmark before
continuing. We take note of any stability problems or the appearance of
artifacts, and then list the maximum stable and artifact-free overclocked speed
the video card can attain.
The ATI RV770 GPU at the heart of
the Asus EAH4850 HTDI/512M/A was slowly clocked up from 625MHz, to 640MHz,
660MHz and 680MHz without any sign of artifacts or instability. Sadly we
weren't able to push the GPU much further, and it ultimately maxed out at
690MHz.
Overclocking the Asus EAH4850 HTDI/512M/A's 512MB of DDR3 memory was pretty
straightforward. Starting at 1000MHz, the memory overclocked all the way to
1175MHz, but this killed the system. We lowered the memory to 1163MHz and the
system remained pretty stable after that.
On a side note, the neat thing about ATI Overdrive is the Auto-tune function is that it will automatically raise clock speeds and check stability for you, and it's usually not that off. When the stability fails Overdrive will reset the card to the last clock settings. This is a quick way to test the limits of the overclocking but Overdrive does not truly stress the card as much as a 3D game would. The best setting for speed and stability was found to be about 10% up the upper limit that Overdrive finds.
A final stable result, has the settings set at 675Mhz for the the GPU Clock
and 1100Mhz for the Memory. Anyway, on with the benchmarks!.
Prelude to Benchmarks:
The details of how the Asus EAH4850 HTDI/512M/A test system was configured for
benchmarking - the specific hardware, software drivers, operating system and
benchmark versions are indicated below. All benchmarks for the Asus EAH4850 HTDI/512M/A were run in
Windows Vista Ultimate, the reference videocards were tested in both Windows XP
and Vista for the DX10 benchmarks.
PCSTATS is in the process of making the transition
to a Windows Vista only test platform, so keep this in mind as you scan the
benchmark results. In the second column are the general specs for the reference
platforms this Radeon HD 4850 videocard is to be compared against. Please take a
moment to look over PCSTATS test system configurations before moving on to the
individual benchmark results on the next page.
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| PCSTATS Test System Configurations |
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