Zitat von Dan85 im Beitrag #1514

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Hi,

I have a issue regarding modified CPU i5 8500b from aliexpress and the problem is that on ASUS ex-b150m-v3 motherboard with modified bios my rx470 not detecting but other gpu old hd 6670 is detecting and rx 470 working in other system but not in modified CPU i5 8500b why is that? and what should be the problem i look for? Can anyone had the same issue please help thnx

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Hallo Dan85,

Well generally said, it seems that the handling of the PCI lines from the CPU and from the chipset is not correct. Maybe the PCIE x16 slot powering does not work correctly in the combination of THIS CPU and THIS MOTHERBOARD. Could be a HW compatibility issue. You know, one of those, you would otherwise never knew off ever in your entire life... since they are not described or mentioned anywhere on the planet. But you were "so lucky" to discover one of those yourself...? Unwillingly...

1. What RX470 brand&type do you have? Is it correctly powered? I mean, PSU strong enough...? 8-pin / 6-pin GPU molex wiring is okay? When overclocked, this can be a +150W card!

2. Was / is the RX470 working on that board before you modded the bios? Lets say, with some Gen 6th or 7th CPU?

3. As far as I can find, the i5 8500B is a 6 core mobile CPU for FCBGA1440. So you have a chinese cripply tranplanted CPU that you want to put into LGA1151, right? Nothing but a huge risk with those CPUs IMHO. However, if they work, then the performance boost over the 6th/7th Gen CPUs would excuse the risk of course.

4. Can you check the RX470 in other PC with AIDA64 or similar tool and confirm it runs at full x16 lines speed? You should be also able to tell this from the bios already! PCIE slots and line distribution is usally found in SA (system agent) menu in Advanced tab. And if there is no other card present in the PCIE x1 slots of the EX-B150M-V3, the PCIE x16 slot should get all 16 lines.

5. Would you dump and post the bios that you are currently using? I would like to see it.

Btw., you are pretty lucky the bios chip is DIP8 package, easy to pull out & push back in the DIP bed!!!

6. The best way would be to start from the scratch! Just flash the latest official bios, make sure all works fine, including the RX470 up to Winsows desktop.

7. Then dump the bios and mod it again ;o))) You would need to inject/update the microcode list and also patch the GOP and ME properly. The SN and the UUID of your board along with the MAC address will be already there, so no bother with that...

8. Maybe use the CFL Tool 0.92 instead of 0.99.

Let me know!

George