Overclock CPU causes GPU driver crash?

[hao1437]

Hey so I recently got myself a new Maximus VII Hero mobo and overclocked my i5 4670k to 4.55Ghz with 103.5 BCLK and I've went thru a few hours of real bench stress testing (didnt keep a record of how long it was but was about 3 hours or so) and I figure it was stable.

 

But what troubles me was when I started up my games like DOTA 2, I get some graphics driver crashes or the game crashes instantly no matter how many times i try to start it. I got so frustrated and even tried downgrading my AMD drivers or upgrading to the latest driver but none of it work. Finally I figured it could be my overclocking so I went ahead and load the default settings with my initial driver that was crashing, and suddenly my game was running fine for about 2 hours of game play!

 

Does anyone here experienced the same thing before? is it my overclocking that's affecting the GPU driver/performance? Or is it just a bad driver from AMD? btw I have a gigabyte R9 280x Rev 2.

[Altecice]

yep thats signs of a not stable OC im afraid. Nothing else you can do except perhaps add voltage or backoff.

Just quickly makesure you have not changed the PCI speed from its default 100.

[LemonSpice]

--snip--

Your problem is that the gpu clock is based off the bclk so when you change it your gpu clock is letsay not mutiplied by 100 but instead 103.25 so your previous overclock on your gpu are too high lower them 

[LemonSpice]

yep thats signs of a not stable OC im afraid. Nothing else you can do except perhaps add voltage or backoff.

Just quickly makesure you have not changed the PCI speed from its default 100.

he changed bclk thats the problem

[Enderman]

Your problem is that the gpu clock is based off the bclk so when you change it your gpu clock is letsay not mutiplied by 100 but instead 103.25 so your previous overclock on your gpu are too high lower them 

BLCK OCing changes your RAM speed in relation your your CPU frequency. It does not affect the GPU at all.

[hao1437]

he changed bclk thats the problem

 

ah okay, so bclk affects my gpu too? and my gpu wasnt overclocked tho.

 

 

BLCK OCing changes your RAM speed in relation your your CPU frequency. It does not affect the GPU at all.

 

ohh that's what i initially thought too, so how is it affecting my GPU then? could it be a bad driver? I'm quite done with AMD always having bad drivers. Not sure if it's just me tho

[Enderman]

ah okay, so bclk affects my gpu too? and my gpu wasnt overclocked tho.

 

 

 

ohh that's what i initially thought too, so how is it affecting my GPU then? could it be a bad driver? I'm quite done with AMD always having bad drivers. Not sure if it's just me tho

Not sure. Try overclocking your PCU properly, by using the multiplier. Leave the BLCK at stock speed then do more tests, see what happens.

It could possibly be the BLCK causing the crashes, but it should definitely not be changing your GPU clock.

[hao1437]

Not sure. Try overclocking your PCU properly, by using the multiplier. Leave the BLCK at stock speed then do more tests, see what happens.

It could possibly be the BLCK causing the crashes, but it should definitely not be changing your GPU clock.

 

Alright then I'd try lower it to 4.5 GHz with bclk at stock 100 and try to run my games again. will update here soon.

[LemonSpice]

BLCK OCing changes your RAM speed in relation your your CPU frequency. It does not affect the GPU at all.

it does affect the gpu because the pcie clock is based of it and so is the gpu clock of the pcie clock jay has a video explaining this i think its his 4790k overclocking video because it happens a lot with haswell

[Enderman]

it does affect the gpu because the pcie clock is based of it and so is the gpu clock of the pcie clock

The PCIe clock has nothing to do with the frequency of your GPU. You can have 3 way SLI with all the GPUs at different frequencies.

[Faa]

The PCIe clock has nothing to do with the frequency of your GPU. You can have 3 way SLI with all the GPUs at different frequencies.

You're slightly wrong; BCLK affects the memory/pcie controller because it's the frequency of the bus which is since Sandy Bridge in a ring form. Anyways BCLK overclocking should be avoided, lock it to 100.00MHz and nothing more, it's not easy to get it stable.

[hao1437]

Alright thanks guys for the info. I've set it to 4.5 with 100mhz and so far it is okay. I suppose it could be that the oc was unstable or the bclk.

[airdeano]

BLCK OCing changes your RAM speed in relation your your CPU frequency. It does not affect the GPU at all.

 

@hao1437

yeah, BLK overclocking directly affects GPU clock speed relationships as well as

any pipe devices (RAM).

 

you usually have to underclock the GPU accordingly to keep tolerances of overclock

with no voltage attachment from unstable GPU overclocking (essentially what you are

doing with BLK overclocking.)

[hao1437]

@hao1437

yeah, BLK overclocking directly affects GPU clock speed relationships as well as

any pipe devices (RAM).

you usually have to underclock the GPU accordingly to keep tolerances of overclock

with no voltage attachment from unstable GPU overclocking (essentially what you are

doing with BLK overclocking.)

Oh, so if I underclock my GPU to a decent level it should be able to run it at a higher bclk just like my CPU and ram?

[airdeano]

Oh, so if I underclock my GPU to a decent level it should be able to run it at a higher bclk just like my CPU and ram?

 

yes. but here is the rub. you have to reflash the GPU BIOS to do it. why?

the legacy drivers do not "under/overclock" unless the BIOS tell it so.

once the OS loads, then the GPU driver and assistants (ASUS GPUTweak, MSI AF,

EVGA Precision, etc) then modulates the under/overclock.

 

if using the iGPU some UEFI allow underclocking of the iGPU (not all).

this is why not many BLK/Strap overclock, gets into more issues. the elders

do like it as this is what they cut their teeth on when OC was breaking into the

enthusiasts platform.

[Faa]

@hao1437

yeah, BLK overclocking directly affects GPU clock speed relationships as well as

any pipe devices (RAM).

 

you usually have to underclock the GPU accordingly to keep tolerances of overclock

with no voltage attachment from unstable GPU overclocking (essentially what you are

doing with BLK overclocking.)

Increasing BCLK doesn't affect the GPU clock speed. It just affects the memory controller/PCIe controller/CPU only. If the PCIe controller isn't stable with BCLK of x, you'll get a crash in a game but if the memory controller can do it perfectly you won't see any crashing in every CPU Stresstests.

It does affect the IGP if I'm not mistaken but he's using an AMD GPU so logically he wouldn't be using it.

[hao1437]

Hey guys appreciate the help and I've set my oc down to 4.4 with 100bclk. Also I've recently changed my mobo from my asrock z87 extreme 4 to maximus vii hero but I'm getting a worse oc result. I've tried tonnes of settings for a week now and it hasn't got any better. It seems like I need way more voltage than I used to on my asrock board. Was able to run 4.6 stable @ 1.335v with temp below 85 but now I can't even get to 4.6 with 1.38

[hao1437]

Well it's kinda irrelevant with my title so I guess I'll just make another topic on this one