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Would it be possible to figure out what is the difference between BootROM 138 and the previous one to see what is changed to enable PCIe 2.0?

Alternatively, is there a good guide for the resistor mod? I have found some info in the past, but that was not really clear to me. Thanks in advance for any help!
I have done the 5.0 GT/s mod on a HD 5870 & a HD 7950 & a HD 7970. but now I really do not think that it is necessary since 140.0.0.0 bootrom in fact it is entirely possible that doing the mod and updating to 138.0.0.0 or 140.0.0.0.0 might cause a conflict.

Why tempt fate ?
 
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I have done the 5.0 GT/s mod on a HD 5870 & a HD 7950 & a HD 7970. but now I really do not think that it is necessary since 140.0.0.0 bootrom in fact it is entirely possible that doing the mod and updating to 138.0.0.0 or 140.0.0.0.0 might cause a conflict.

Why tempt fate ?
evdberg has a MP3,1.
 
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@MIKX, can you point me to a good guide or tutorial for the resistor mod?

Does this problem also arise with NVidia cards?
 
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