Comment # 39
on bug 76490
from Alex Deucher
(In reply to Tobias Droste from comment #35) > 3) This card works fine with any sclk/mclk combination with the same vddc > (1238mV) in windows and I can overclock there! There is apparently some aspect of the set up that we are not programming correctly that manifests with higher clocks on certain boards. > > I'm also wondering why I get a different VBIOS size if I get the bios in > windows (gpu-z) and linux. Is it because different firmware gets loaded? The > (working) vbios under windows is twice as large as the linux one (see > attachments). The vbios is loaded from rom on the card. The firmware for the various micro-controllers on the GPU are loaded by the driver and are not part of the vbios. I'm not sure off hand why they differ. Perhaps gpuz always returns a 128K image regardless of what size the actual bios is? Or maybe it asks the driver windows driver for a copy and the windows driver always stores 128K images regardless of the actual image size. I quick look at the tables and I only see one small difference in the overdrive table: -OD max sclk: 140000, max mclk: 162500 (win) +OD max sclk: 107000, max mclk: 140000 (linux) Everything else appears to be the same. I'm guessing the windows driver patched that and gpuz fetches the copy from the driver.
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