PC does not POST after Overclocking APU with a discrete GPU installed.

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julian23561

julian23561

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Jan 25, 2013
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Hello!

Recently, I bought a Gigabyte RX 460 2G Windforce edition, had it installed in my APU based system, then turned it on, excited to start playing some games.
Unfortunately though, it would not POST, just a blank screen and not even any beep from the motherboard. I reset the CMOS and it booted correctly but I lost my APU overclocks, I tried applying my overclocks again hoping it would work this time but no dice, still the same.
It only happens when I try overclocking the APU with a discrete GPU installed, overclocking it without it is fine. Any suggestions? Answers would be greatly appreciated, thanks in advance, cheers!

My system specs are:
-AMD A8-7600 4-Core APU
-MSI A68HM-E33 V2 FM2+ Motherboard
-8GB (4GBx2)Kingston HyperX DDR3-2133 RAM
-Gigabyte Radeon RX 460 2GB Windforce Edition
-500GB Seagate Barracuda Drive 7200RPM
-500GB Samsung Drive 5400RPM
-Cougar SL500W 80% Efficient PSU
-DeepCool IceEdge 300 Tower CPU Cooler
-Emaxx Rebel Micro ATX Case
 
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julian23561

julian23561

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Jan 25, 2013
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It turns on, fans spin up, hard drives spin up, it just doesn't POST. The PSU is OK, I've over clocked the APU before, without the GPU installed it boots fine, but once it's installed in the system, it doesn't POST when any kind of OC is applied to the APU. I've set the RAM timings to default but upped the speed to 2133MHz (max speed the mobo can support) from a default 1866.
 
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julian23561

julian23561

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Jan 25, 2013
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I use BCLK overclocking since the multiplier is locked, I didn't make any changes to the voltage since there are no options in the UEFI. This MSI motherboard is really limited, I kind of regret buying it.
 
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warmon6

warmon6

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Jul 24, 2009
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So if im getting everything right, when every thing is stock, RX 460 works. when you do BCLK overclocking, the RX 460 stop working?

I could be wrong but it sounds like to me the gpu isn't liking that because that overclocking is also overclocking the PCI-e bus as well.

On these apu's, blck overclocking not only overclock the cpu but also nearly (if not) every bus on the motherboard. So PCI-e, Memory, Sata, and more gets overclocked as well and some of them dont take to kindly to that. (Mainly sata and pci-e)

So it would explain why when you overclocked the apu without the RX460 it'll work just fine (as your not using the PCI-e bus) but it stops working when your put the RX 460 in.


Like said could be wrong and could be the PSU as harrisjb78 pointed out but that's what it sounds like the issue to me.

and based on my experience with playing around bclk on my gigabyte ga-f2a88xn-wifi board with an A10-7850k, my system really dislike this method of overclocking.
 
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julian23561

julian23561

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I guess that might be it, I did set the SATA controller to IDE, and set the RAM at stock speeds, but I didn't fiddle with PCI-e clocks.

I guess I can experiment with that, but I don't really know much about PCI-e OCing. I need to do my research then. Thanks.

 
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J

JCLDJB

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May 24, 2016
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Yes, please watch out for BCLK overclocking as it will increase the PCI-E voltage/frequencies, may damage your brand new RX460.
BCLK as said will increase the PCI-e clock without you realising it.
How far did you go on the the BCLK?
Try a lower BCLK overclock maybe?

**ON ANOTHER NOTE - YOUR MSI MOTHERBOARD MAY HAVE MORE OPTIONS THAN YOU THINK**

I have an A68hm-e33 v2 and only realised after many months, that the options that do not have a drop-down menu, (you can 'hover' over them, as in they aren't completely greyed out) try going over it with the keyboard and pressing the + or - signs to see if the values change.
This worked for me on the same board and an A8-7650K - K meaning multiplier unlocked, but I could also increase RAM BCLK etc by pressing the + and - keys on options that 'didn't seem accessible before, but are now'.

Try it out, might work ;)

 
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harrisjb78

harrisjb78

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As the others have said BCLK overclocking is risky and doesn't always work. I know you have AMD but on the Intel 1150's this is especially true as it overclocks EVERYTHING so it can become unstable and may even cause damage.
Be careful with it.
 
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julian23561

julian23561

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Jan 25, 2013
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I haven't made any overclocks since any changes to the BCLK will most certainly not POST. I didn't try lowering the BCLK though, since it would be counterintuitive to what I wanted to do. I will try and lower the PCIe clocks from the default 100 clocks, see if I can get anything from that.
The MSI mobo I have is actually limited, you have no option to change voltages, and I can't even get over 105mhz on the BCLK, and I do know how to change the values, the motherboard BIOS just limits me.
Anyway, thanks for the reply!
 
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