Gigabyte EP45-DS3P + Xeon 5450 overclock help please

[Headrush]

Re: Gigabyte EP45-DS3P + Xeon 5450 overclock help please

I dropped Vcore to 1.38750 = 1.36 in CPU-Z, which dropped to a constant 1.296 during IBT. Best result was 456MHz...

[Chike]

Re: Gigabyte EP45-DS3P + Xeon 5450 overclock help please

Pretty good for 4 days overclocking isn't it?
Maybe I should get this CPU, need to check I cot LGA 775 board that works.

[Headrush]

Re: Gigabyte EP45-DS3P + Xeon 5450 overclock help please

Like they say, it's not over until the fat lady sings... I started Prime before going to bed but awoke to find Worker 4 stopped after 30mins. Research suggests more Vcore for this problem but as we are already at 1.36V (CPU-Z) while idle, dropping to 1.3V under load, I guess I should start backing down FSB until Prime is happy.

Or - Do I increase VCore but keep CPU-Z at or below 1.35V under load?
Or - Back off 1 or 2 clicks FSB
Or - Is there something else in the last screenshot you can see that might need tweaking up or down?

It would ne nice to keep 4.1GHz as it's a nice round number and sounds cool :D but 4GHz+ don't sound too bad either hehe. I'll have a little muck about with it, maybe disable some unrequired systems in BIOS like floppy, parallel, that kinda stuff for what it's worth. Chat later o/

[Chike]

Re: Gigabyte EP45-DS3P + Xeon 5450 overclock help please

The datasheet says 1.35v max so you probably don't want to keep it much higher for a long time.
What prime test failed (FFT size)

I think 2nd option, dropping FSB 2 clicks at a time.

You were ready to give up at 3.8GHz, now you want to hold on to 4.1GHz, like they say, the appetite comes with eating.

[Headrush]

Re: Gigabyte EP45-DS3P + Xeon 5450 overclock help please

It was small FFTs.. I started it again earlier after making some unrelated changes in BIOS. Basically disabled stuff I don't need (firefire, IDE, floppy, serial port, network2, etc) and switched HPET Support to 64bit, switched on HDD Smart. I don't think any of this stuff would effect the overclock. Anyhow Prime95 small FFTs stopped responded after 2 hours, the whole program just gave up while all workers were at same state and running. Maybe NB got too hot? Hard to say. I will try dropping MCH Core back to 1.2V and ICH I/O back to default 1.1V, I'm not even sure why I raised them in the first place, just seemed like a good idea at the time ;) So where do I want see Vcore max 1.35V in CPU-Z idle or set it in stone at BIOS? Incidentally I ran MemTest at 456x9 1.92V DRAM yesterday for 3 passes and got zero errors. I'll start Prime again now at 455 and see what happens. Thanks again for your help mate, really appreciate it..

[Chike]

Re: Gigabyte EP45-DS3P + Xeon 5450 overclock help please

I always went by CPU-Z but I had Load Line calibration which make the difference quite small.
It is your setup you make the rules... and take the risks.

[Headrush]

Re: Gigabyte EP45-DS3P + Xeon 5450 overclock help please

I've decided Forty Fifty (4050) sounds like a nice number too Prime seems to be running ok at 455MHz so it should be fairly stable at 450MHz and I might be able to drop the Vcore a click or 2. I haven't played PC games in years, I was a massive UT99 fan back in the day and played in cups and leagues and stuff at ClanBase but eventually grew out of it. Now I want to play this new Elite Dangerous space sim which demands the best I can get out of this rig but when I'm not playing I will be booting into much lower specs, I plan to have 2 or 3 different profiles to choose from. Next up is the Graphics Card so might be back for some more advise on that.. Cheers bro