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Question W3680 overclock

Feb 28, 2020
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hello guys,so first i have this Spec


Xeon w3680 3.33 GHz 6 core
Gigabyte gtx 670 windforce 3x OC 2GB
10 GB ram 1336 Mhz 2*5
625 PSU 80 plus bronze

and the Case is a lenovo thinkstation S20 Workstation

and i was need to overclock my CPU but i don't have settings in bios so i tried to overclock it with ThrottleStop

when i unmark disable turbo and put it at 29x133 it gives me 3.8GHz
but i MSI after burner it gives me only 3.45GHz
so what is this i can't overclock it or what
anyone can help me
 

86zx

Upstanding
Nov 1, 2019
484
89
290
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You can try to use setfsb but likely it won’t have your fsb chip but it’s worth a try see if others have tried it on your workstation. I do recommend not going too crazy once you get over 4ghz it uses way more power and gets way hotter. I had a x5660 running at 4.5ghz and it was water cooled with a bathroom fan sucking the air out of the case and still was at 72-75c
 
Feb 28, 2020
45
2
35
0
You can try to use setfsb but likely it won’t have your fsb chip but it’s worth a try see if others have tried it on your workstation. I do recommend not going too crazy once you get over 4ghz it uses way more power and gets way hotter. I had a x5660 running at 4.5ghz and it was water cooled with a bathroom fan sucking the air out of the case and still was at 72-75c
soory but i can't overclock it nothing happen when i click Set FSB
but i stress with CPU-Z and it gives me 3.7 GHz at 28x133?
 
May 22, 2020
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The W3680 has an unlocked multiplier so there is no reason to use SetFSB. Some monitoring programs do not report the MHz correctly when you increase the multiplier while in Windows. CPU-Z should be OK and you can definitely trust the MHz reported by ThrottleStop.

A Lenovo workstation will not allow you to increase the CPU voltage so your limit will be a 30 or 31 multiplier. That will get you 4000 MHz or 4133 MHz. The important thing is to increase the TDP. You need to do this so the CPU can use this multiplier when fully loaded. If you do not increase the TDP, the CPU will power limit throttle. Here is a good example of some testing I did that shows the relationship between TDP and CPU speed.

View: https://i.imgur.com/WTU1huC.png


The 30 multiplier was Prime95 stable. The 31 multiplier was OK running the TS Bench but it created too much heat for Prime95 stability.

View: https://i.imgur.com/AJEWPZt.png
 

86zx

Upstanding
Nov 1, 2019
484
89
290
18
The W3680 has an unlocked multiplier so there is no reason to use SetFSB. Some monitoring programs do not report the MHz correctly when you increase the multiplier while in Windows. CPU-Z should be OK and you can definitely trust the MHz reported by ThrottleStop.

A Lenovo workstation will not allow you to increase the CPU voltage so your limit will be a 30 or 31 multiplier. That will get you 4000 MHz or 4133 MHz. The important thing is to increase the TDP. You need to do this so the CPU can use this multiplier when fully loaded. If you do not increase the TDP, the CPU will power limit throttle. Here is a good example of some testing I did that shows the relationship between TDP and CPU speed.

View: https://i.imgur.com/WTU1huC.png


The 30 multiplier was Prime95 stable. The 31 multiplier was OK running the TS Bench but it created too much heat for Prime95 stability.

View: https://i.imgur.com/AJEWPZt.png
I’m sure it’s from cpu to cpu but in my testing fsb overclocked higher than a multiplier overclock. When I would multiplier overclock my i7 920 it would only reach 3.6 or so but with fsb overclocking it would hit 3.8 even if the projected MHz were similar
 
Feb 28, 2020
45
2
35
0
The W3680 has an unlocked multiplier so there is no reason to use SetFSB. Some monitoring programs do not report the MHz correctly when you increase the multiplier while in Windows. CPU-Z should be OK and you can definitely trust the MHz reported by ThrottleStop.

A Lenovo workstation will not allow you to increase the CPU voltage so your limit will be a 30 or 31 multiplier. That will get you 4000 MHz or 4133 MHz. The important thing is to increase the TDP. You need to do this so the CPU can use this multiplier when fully loaded. If you do not increase the TDP, the CPU will power limit throttle. Here is a good example of some testing I did that shows the relationship between TDP and CPU speed.

View: https://i.imgur.com/WTU1huC.png


The 30 multiplier was Prime95 stable. The 31 multiplier was OK running the TS Bench but it created too much heat for Prime95 stability.

View: https://i.imgur.com/AJEWPZt.png
ok but i'm just want a 3.8 GHz for (Gaming-Rendaring-etc) so what (TDP and TDC) should i put?

and thank u for replying
 
May 22, 2020
8
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20
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The 29 multiplier will get you 3.86 GHz.

TDP = 180 and TDC =110

These values will help prevent any turbo power limit throttling.
 

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