That's what I am thinking. 270X and 7950 both belongs to GCN 1. Their PCB may be similar. The chance that the same R17 resistor doing the same job is not too slim. So, it's possible to locate it. However, if the key resistor is not R17. Then I am really surprised that MIKX can find it. That's definitely not an easy job, require lots of testing, studying, thinking, and finally brave enough to physically remove it to confirm if that's really the correct resistor.Great work finding the resistor on R9 270X! I guess it might make more sense to use a HD 7870 though, since those cards have a matching framebuffer personality (Futomaki). The 270X will lose some ports in macOS due to mismatched connectors. That shouldn't happen on reference 7870's.
Resistor location might be the same, as those cards are closely related...?
I really believe that your expectation is too high. As I said, most active members already moved on, and do not have 5870 on hand anymore. It's impossible for us to confirm your finding if we don't have proper card to test it.I got pi**ed off waiting for anyone to re-confirm that this mod works on cards OTHER THAN the HIS 5870 & Sapphire Varpor-x 1 Gb cards.
Crossfire itself doesn't need 5GT/sI already have 7 cards .. no 7870. 7970 next or higher. I'm still paying for my two kids university fees so might be a while.
Fl0r!an, why do you think Apple enabled 5.0 GT/s on so many of their retail cards? Possible it was for a future OS X CrossFire adoption ? What would 5.0 GT/s be used with ?
Do you mind to post the link here? I don't mind to study that and have a try (if I can understand how to do it properly).Ok thats what I thought. Has anyone tried the Mac Pro PCI offset command to get 5GT/sec on the netkas forums ? If so has it worked ?
VEGA works at x16, 5GT/s on Mac Pro 5.1I did R17 mod on my HIS R9 280 some time ago. And after that, I confirmed there is virtually no gain on such low level card (using 2017 standard). And I suspect that's the reason why no one interesting in the 5870 mod. This card is very old now, not many members here still running this card (especially the active members). Also, most of us know the gain in real world is virtually zero in most of the time.
However, even though I have no intention to mod my current R9 380 but I still interested in how you find the relative resistor on other cards. 5870 is understandable, because there is a Mac version to follow / compare.
However, the R9 270X has no reference. Or it's also named R17 because it's also a GCN 1st gen card?
I personally believe even though RX580 doesn't quite need this mod. I assume it can gain few % for most operation, but that's it. Still not quite worth to take the risk. But I am sure quite a few guys interested in it, especially if there is a way to make the Sapphire PUSLE RX580 8GB run at PCIe 2.0.
Also, the coming Vega is another story, I assume PCIe 1.1 x16 can be the bottleneck for this card (when the software / driver mature).
I wonder if you have a systematic way to find out the key resistor. And if this kind of method will work on the Polarise / Vega graphic cards.
Anyway, if you prefer to keep it as a secret, that's fine. I 100% respect your decision. You have no responsibility to share your finding to us. But I just want to let you know my point of view why seems no one interested in the 5GT/s mod on that particular card. It's not no one appreciate your work / sharing, but simply that's an outdated card for most active members. We may not even have the card on hand to test your finding. Hard to give any feedback to you.
However, if you willing to share your methodology on how to find the key resistor. I am quite sure few guys here will be more interested to join the discussion, and may even try to make it happen on the new GPUs.
In fact, I don't mind to take the risk on my R9 380 to test your theory, but it's all up to you if you willing to tell us about your finding, and if I can follow the logic, and reasonably believe why that one should be the key resistor.
It says my card running at 2.5GT/s, but test result shows 5GT/sWhy should it not be accurate?
But that’s a known nvidia bug.It says my card running at 2.5GT/s, but test result shows 5GT/s
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On the other hand, it says the Vega can run at 8GT/s. Apart from it's totally impossible for a cMP, the test result suggests that it's just running at 2.5GT's from the other's post.
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