Overclocking gives me lower performance??

[Iamzod]

I'm running an old system with a 3570k, RX580, Asus P8Z77V, Corsair 750w PSU and Corsair Vengeace 1600MHz RAM.

I ended up resetting the BIOS trying to fix an issue that turned out to be a dead HDD and am trying to get it back up to it's previous overclock of 4.4GHz (it was stable at 4.5+ but it was getting toasty, i've since changed the cooling though so would like to go higher if poss)

When I overclock performance increases as expected, however to get past 4.2GHz i need to up the voltage a little as at stock it seems to want to undervolt & run at 1.088v.

I'm noticing performance loss in benchmarks as soon as I touch the voltage though which I find odd, anyone want to shed some light on what might be happening here?

Some results -

• Default Settings (3670MHz / Load temp 53c / RAM Speed DDR1333)
  • Intel XTU Score 702
  • Passmark 3668.6
  • CPU Mark 5014.9
  • Memory Mark 2382.6
• If I set XMP I get (4181MHz / Load Temp 64c / Ram Speed DDR1600ish)
  • Intel XTU Score 570
  • Passmark 3876.6
  • CPU Mark 5555.0
  • Memory Mark 2374.1
• If i leave all settings stock but just change the multiplier (4100MHz/Load Temp 61c/DDR1333)
  • Intel XTU Score 735
  • Passmark 3999.5
  • CPU Mark 5733.6
  • Memory Mark 2509.4

The XMP score was disappointing so i'm trying to figure out what's going on, so keeping all settings the same as above I manually set the Voltage Offset to +0.110v which gives me a load voltage of 1.296v which is about where I had it in the past & waht i Need to get to the 4.4-4.5GHz + area & scores drop, even setting it to +0.005v kills the scores & it seems to actually drop the voltage from the Auto setting.

• At 1.296v (4100MHz/Load Temp62c/DDR1333)
  • Intel XTU Score 549
  • Passmark 3895.7
  • CPU Mark 5521.1
  • Memory Mark 2355.4

Any ideas as to what is going on?

 

[skypickle]

What cooler? Your probably throttling due to temp.

 

[Meddling-Monk]

Hmmm, what's the voltage settings in play there? I only see the 1.296v for your voltage modified benchmark at the bottom.

I don't have experience with the Bios from Asus from that generation or I'd be able to suggest more to look over. But I know that I never enabled XMP on the Z77 rig I have, just manually selected the frequency and that was it. XMP threw a tiny tantrum every time instead when I did try to get it going.

A quick benchmark reference for comparison:
3570 (non-k), 4Ghz (x40 multiplier), running at 1.07v at load (0.78v at idle), max 58C package (due to cooling decision), 16GB DDR3 1600Mhz Corsair Vengeance (via 4 x 4GB Sticks), HD7750, Gigabyte D3H Z77
Intel XTU Score : 782

And this was done over a Remote Desktop connection to the Z77 rig. How hard did you run your CPU and PSU previously? Could it have degraded them from prolonged extended use?

For reference, I tried to move a Corsair HX650W Bronze PSU over to this Z77 rig, to replace the Corsair HX620W 80+ inside it. But found that the hard life it had in the main rig it was powering, has left it with a louder fan and voltages that are in a wider margin of error than the existing HX620W because it was used less. Swapped them back around afterwards. Wondering if that might have happened here also? The Z77 + 3570 chips were from 2012 after all, so at least 7 years old.

 

[Iamzod]

And this was done over a Remote Desktop connection to the Z77 rig. How hard did you run your CPU and PSU previously? Could it have degraded them from prolonged extended use?

It was at 4.5GHz for a year or two but then dropped back to 4.4 as I started to get a few issues, it's been at 4.4GHz for at least 6 years.

It was sat under an Arctic Freezer 13 Pro but I just swapped it to a 280mm Arctic Liquid Freezer 2 AIO as the bearings were going in the fan & the new cooler looks to be AM4 compatible which fits my plans for next summer.

There are no stability issues, if it wasn't for the benchmarks I might even not know of any problem, I can get it back up to 4.5GHz and it not fail Prime 95 but it's not playing ball in benchmarks.