X5650 Poor overclock - Am i doing something wrong?

krecha64

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Dec 6, 2017
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I'm a new guy when it comes to baseclock overclocking. I've been doing plenty of that on new systems and CPU's with unlocked multiplier and since I was feeling confident with that, I wanted to give the oldschool technique a try.

Bought myself a bargain X58 Pro-e, although I know it's not top of the line, and X5650 alongside with 12GB of ram and 1060 3GB to create a strong, but budget-friendly gaming machine.
When the components arrived, I replaced thermal paste on NB and SB with Gelid GC Extreme. The old paste was pretty crusty and I had to soak it in alcohol a few times before attempting to remove it. The VRM thermal pads were in pretty good condition, so I decided to not swap them out. Got the CPU in place, an AIO installed and ran the system for the first time. Despite the thorough cleaning with alcohol and wipes, the northbridge temps are still very high (around 65C idle), so I think I might have put too much paste on it (It has foam around the place where the heatsink contacts the die which may prevent excess paste from leaking out the sides).

To my point - I'm currently running 175Mhz baseclock with a locked multiplier of 20 giving me 3500Mhz on stock voltage. The max I can do is 3600Mhz and then despite raising the CPU voltage, CPU PLL voltage, QPI voltage to the max safe levels, even a minor baseclock increase results in unstable overclock. I've also tinkered and raised NB voltage and ICH voltage a bit, but with no success aswell.

Could the instability be a reason of high NB temperature? And could the temperature be the reason of too much thermal paste applied? Maybe I'm missing some settings I can tinker around with to get more stable overclock on my chip? Or is the motherboard or CPU itself just not sufficient for a higher overclock?

Looking forward to any advices :)
 
Solution


looks like it has a 4+1 power phase design, probably not suited for the highest overclocks

krecha64

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Dec 6, 2017
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To be fair, I'm totally cool with the overclock and the performance I got given the price of the chip itself. The fact is though, that many people hit 4+Ghz on air with those, scoring 1100+ in Cinebench R15, while mine scores just over 850 and because it's not my main rig, if I can push it harder, I certainly will want to do that.
 

krecha64

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Dec 6, 2017
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It's around triple the price of x5650 where I live, so if I had that money, i'd probably just invest it in a better motherboard, because I believe it's the culprit. I've also read somewhere that Pro and Pro-E overclocks X cpu's badly, but no confirmation on other sites.
 

larrycumming

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Aug 15, 2018
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looks like it has a 4+1 power phase design, probably not suited for the highest overclocks
 
Solution

krecha64

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Dec 6, 2017
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Yup, that's right. I got another X5650 later on along with a bargain high-end X58 board. Went to 4.5GHz without increase in voltage. Not even going any higher, because the temperatures are already in ~75's. Probably could do better with higher multiplier chip and a better cooler.