EAH4770 FML HTDI/512MD5/A videocard ships with its ATI 'RV740' GPU running at 750MHz and 512MB of GDDR5 memory clocked at a respectable 800MHz, or effective 3.2GHz (quad-pumped).
always, PCSTATS overclocked the videocard through ATI's Catalyst Control Center
using ATI Overdrive. The fan was set to run at 100% from the start and 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
artifacts, then list the maximum stable and artifact-free overclocked speed the
videocard achieves. The same process is repeated with the memory, then both GPU
and memory are overclocked together.
ASUS' EAH4770 FORMULA is a mainstream videocard, which
generally means good overclocking is to come. Unfortunately the overclocking
sliders in ATI Catalyst Control Center don't have all that much range... in fact
the GPU could be overclocked to a maximum of just 830MHz.
Considering this, we didn't bother increasing the clock speed in small jumps, and instead went
right for gold. The Radeon HD 4770 was pushed from its default of 750MHz right
to 830MHz in one fell swoop. The graphics card handled this without breaking a
sweat - no visible artifacts or instability.
The memory options were similarly limited by ATI Overdrive,
so with the GPU back at stock speeds the 512MB of GDDR5 memory on the ASUS
EAH4770 FORMULA was aggressively overclocked right to the max - 850MHz.
As you might have already guessed, without any effort PCSTATS was able to overclock
ASUS' EAH4770 FORMULA videocard to 830MHz GPU / 850MHz memory. A nice videocard overclock sure, but I couldn't help thinking that the Radeon HD 4770 has a lot more headroom to spare...