For which kind of card/memory is that strap?

After reading OC.net hawaii bios editing post, and reading this post a few times, I've tried to learn to do it myself. Before starting to learn about custom timing, i've just copied lower clock timings into higher ones, with gains around 5% at same gpu/mem clocks, not bad. I'll try to explain how I did it, because it's been hard for me to understand at first how to do it, so I hope it helps other ppl.

Everything done under windows (I have ubuntu also, but i find myself more comfortable in windows, dont kill me for it).

First of all, I downloaded both original BIOS using GPU-Z (Button right to BIOS version). Save them as backup.

Then, open the one you want to modify with Hex Workshop
It looks (correct me please if I'm wrong), that some of the Hawaii timings use to start with 77 71 (that's been the case for my Hynix AJR), so I made a search (Ctrl+F) for Hex Values 7771.


Then, look at the 4 pair of numbers before the 77 71 pairs, select them with mouse and look at the right column "Data Inspector" for the int32 value, thats the Mhz of the memstrap
multiplied by 100. If you want to find the rest of the straps, put mouse cursor before 77 and add an offset (Ctrl+G) of 48 bytes (thats the case for my BIOS/memory type, if its not the case, search for the next 77 71 and use 4 pairs before).

For a R9 390X bios with Hynix AJR, straps are 800-900-1000-1125-1250-1375-1425-1500-1625-1750-2000.

So for this BIOS, i chose to copy the 1250 memstrap into the 1375,1425,1500 and 1625 ones. 1250 memstrap for me is this one: 77713320000000008CC5583460550F0F2C94B8070048C50022FF1C085C0F14205A8900A00000012 0120D23287B222D13



After this, you can also mod gpu/mem clocks, voltages and fan speed with HawaiiBiosReader

With all these changes you will need to fix BIOS checksum. Use the .exe OhGodACsumFixer.exe posted in OP by opening it with cmd. Just paste .exe in the same dir as the bios, go there with an administrator plivilege cmd and type OhGodACsumFixer.exe BIOSNAME. Check if checksum is OK using HawaiiBiosReader.



I'm totally a noob at this so please, correct me if im wrong. I haven't tried any bios with more than 1 memory type, that could change some values, so please, be careful.