Why has my overclock suddenly failed to boot?

Phonesis

Phonesis

Phonesis

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Hi all,

I've got an OcUK built rig from mid 2009. It has an overclocked i7 920 at 3.6ghz running on a Gigabyte EX58-ED3R motherboard.

I have never touched the OcUK bios preset and have it loaded in my bios. However, I've noticed that since a day or two ago my rig now boots to stock settings. I have tried re loading the OcUK preset multiple times but my system then just fails to boot every time and resets back to stock.

I put some new ram (16gb) and a GPU in a few weeks back but my overclock was fine and continued to be fine until a few days ago. So it's not a memory timings issue I don't think.

The bus speed was set by OcUK to 180 Mhz and is now defaulting to 130 Mhz, giving me 2.6 ghz.

Is there anything I can try or is this just a case of the CPU degrading to the point where it can't handle an overclock now? It's about 3 1/2 years old now. Is it worth me attempting a bus speed somewhere in the middle to achieve a slightly lower overclock than what I was getting?
 
Ok this could be the problem

How many sticks of ram did you have when you got the system?

And ho many have you got now?

You could be stessing the north bridge is it or south bridge that handles memeory etc (correct me some one please)

There for you may have to up the voltage on the SB or NB.

Wait for confirmation from a pro but this could be the issue
 
D.Roberts said:
Ok this could be the problem

How many sticks of ram did you have when you got the system?

And ho many have you got now?

You could be stessing the north bridge is it or south bridge that handles memeory etc (correct me some one please)

There for you may have to up the voltage on the SB or NB.

Wait for confirmation from a pro but this could be the issue
Click to expand...

Thanks for your reply.

I originally had 3x OZ Gold 2gb sticks, so 6gb in total.

I recently upgraded to 4x 4gb sticks (16gb) so am using all 4 slots now.

The thing is my overclock was fine for weeks (I checked CPU-Z quite a few times) after adding the ram. This has only recently happened. Only thing I had to do at the time was alter the timings from "quick" to "auto" in the Gigabyte BIOS settings as quick was causing a boot failure.
 
The preloaded settings for your old ram is proberbly just no good for your new ram, they could be running at the wrong timings or voltage.
 
Thanks for the replies.

I have played around a bit and it doesn't look like ram is the issue. I decided to increase the bus speed incrementally from 131 (stock) to 150 Mhz (giving me 3.0 Ghz overclock). This worked and seems stable.

So I'll continue upping the bus speed and see how close to 180 Mhz (the original OcUK setting) I can reach before it fails to boot. Odd that this has occurred but hopefully I'll only need to settle for a minor reduction of my original overclock.
 
Update:

So looks like 150 Mhz Bus Speed is the max my rig can now handle before it fails to boot. I can live with that as 3.0 Ghz is fast enough I guess. Just odd that this has happened.

Anyone got any idea what could have caused this? Just a case of CPU degradation? All the fans etc seem to be working as well as they've ever been.
 
Hi.. i could be that now you have more RAM installed the qpl volts need to be increased a click or two.
Keeping in mind the safe limits.
You could also try removing a stick of ram and leave volts as they are. And or lowering the uncore ratio down to 2x of the RAM htz instead of raising volts.

Correct me if im wrong someone...
 
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