Sapphire Radeon HD 6770 Vapor-X Video Card Review



Product: Sapphire Radeon HD 6770 Vapor-X
Company: Sapphire
Author: James Prior
Editor: Pete Vagiakos
Date: June 7th, 2011

Overclocking & Image Quality

Overclocking

Without any voltage controls, overclocking headroom was limited. We achieved an overclock of 915MHz on the core, and 1385MHz on the RAM. This represents an increase of ~6% and ~15% respectively, with the memory clocks giving us the most surprising increase, at ~5.5Gbps QDR.

Sapphire HD 6770 Vapor-X O/C

In action, the Sapphire HD 6770 Vapor-X ran hotter than we anticipated, given the custom cooling nature of the design. At stock clocks, MSI Kombustor and gaming loads would give a peak temperature of ~85C. When overclocked, this ramped up to ~95C, even with the fan on full speed. The fan is audible at speeds over ~75% but not too irritating. At stock clocks it is not intrusive but it is not silent, either. The high temperatures could be the result of our test configuration, where the axial fan is starved of air due to the add-in board adjacent to it - the Creative Audigy 2. The reference design blower fan mounted at the end of the card would have a better air intake in the same circumstance. Running the card in the upper slot of our test system reduced load temperatures to high 70C range at stock clocks.

Image Quality

Below you can see the anisotropic filtering in action, demonstrating kernel transitions and angle dependency.

HD 6770 Angle Dependency
HD 6790 Angle Dependency

Both the HD 5000 series and HD 6000 series are angle independent, meaning textures should be filtered exactly the same way regardless of angle to the viewer. The kernel transition test shows where banding, and therefore possibly flickering, could be evident. It also shows how much detail is shown at far distances, before the filtering is ineffective at reproducing detail.

HD 6770 Kernel Transitions
HD 6790 Kernel Transitions

Bart's GPU features improved AF hardware which results in a better transition, although angle dependence is unchanged – still uniform, regardless of angle. You can read more about filtering in our article here. For today's tests, Catalyst AI was set to the default position Quality and Mipmap detail level was set to Quality.

Sapphire HD 5770 and HD 6770 Vapor-X Crossfire