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FX-8350 Overclocking Limits

Tags:
  • Overclocking
  • CPUs
  • Cooling
  • Hyper T4
  • H80i
Last response: in Overclocking
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May 12, 2014 9:48:31 PM

I just upgraded my CPU cooler from a Hyper T4 to a H80i. T4 ran at 56C on load, and the H80i ran at 48 on load (same ambient temp, multiplier, and voltage). That's a noticeable difference but not as much of a difference as I was expecting. I have only been able to increase my OC from 4.5(1.325v) to 4.7(1.35v) and I was hoping to go as far as 4.8. Unfortunately I have run into 2 major problems. One issue is that once I got past 1.4v the CPU was running too hot to comfortably leave it at that temp for an extended period of time. I was expecting to see a dramatic difference in temps between these two coolers considering the reviews I have read about them. There also seems to be a brick wall past 4.7 where I kept going up in voltage but never was able to make the system survive a Prime95 test. Most of the guides I have looked into found that getting to 4.8 was a simple task, but I couldn't get there even when I had my voltage up to 1.45v.

More about : 8350 overclocking limits

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May 12, 2014 9:50:21 PM

Using the H100, same wall. I barely hit 4.8 before it got to hot. Same chip. Asus Sabertooth 990FX R2.0
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May 12, 2014 9:53:00 PM

Heat is the limit on those chips. If you can cool it, it keeps on clocking. ^^ that's about typical for dual rad AIO or big air cooler.
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May 12, 2014 10:02:46 PM

Alec Mowat said:
Using the H100, same wall. I barely hit 4.8 before it got to hot. Same chip. Asus Sabertooth 990FX R2.0


Same motherboard exactly. I was worried because of my limited room I woulden't be able to fit a full H100i and that might have been the reason its performing so poorly but I guess not. Thank you for verifying that its happening to other people.
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May 12, 2014 10:04:57 PM

i7Baby said:
Water coolers aren't that much better than air coolers.

http://www.anandtech.com/bench/CPUCooling/774


I'm sorry but you had that graph set to noise levels. When you set it to load temps its actually a pretty dramatic difference.

The difference between the H80i and the 212 EVO are 7 degrees, and the EVO is a noticeably better cooler than the T4.
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May 14, 2014 7:07:58 AM

What RAM are you running? Speed and size?
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May 14, 2014 7:44:36 AM

4.6ghz and beyond can be problematic on the 8350 depending on the quality of the chip.

Some people can hit huge voltage/temp walls all of a sudden.

However, you seem to have a decent chip if you've got 4.7ghz @ 1.37v stable

When you mentioned not being comfortable with the temps you reach at 4.8, what kind of temps are we talking about?

As long as you're within 62C core and 72C socket, then it's fine.

My 8350 runs stable at 4.8 @ 1.48v. Under load max core 49C socket 58C
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a c 427 K Overclocking
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May 14, 2014 8:51:05 PM

Phanteks PH-TC14PE. 1.452 VOLTS

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May 15, 2014 2:16:46 AM

now that's a good result on 1.45v *insert jealous face here* :D 
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May 16, 2014 12:25:00 PM

http://tinypic.com/r/2igklc4/8

Here is the majority of the case. There are also 2 120mm case fans on front intake. I am under the impression that the heatsink right under the h80i is the vcore. In that case that isnt getting any kind of serious air pressure.

When I was overclocking all my fans were set to max speed. Thats how I settled at 4.7
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May 16, 2014 1:24:24 AM

i7Baby said:
60C for gaming is a bit hot. Non-gaming (normal use) its waaaay too hot. Back off voltage 0.01v, spin up fans


Unfortunately I didn't think about the motherboard components when I got my H80i and it completely blocks off any kind of serious airflow getting to the vcore. Its so thick that when I mount it on the rear exhaust vent It sticks out almost all the way to the CPU itself. The top fans would be pulling some air vertically through that area, but the fins on its heatsink are aimed horizontally so it woulden't be benefiting all that much.

The reason I got the H80i and not the H100i is because the top of the case doesnt have enough room for a radiator AND and pair of fans because of the RAM slots and and CPU power plug getting in the way.
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May 16, 2014 3:19:38 PM

istari675 said:
i7Baby said:
60C for gaming is a bit hot. Non-gaming (normal use) its waaaay too hot. Back off voltage 0.01v, spin up fans


Unfortunately I didn't think about the motherboard components when I got my H80i and it completely blocks off any kind of serious airflow getting to the vcore. Its so thick that when I mount it on the rear exhaust vent It sticks out almost all the way to the CPU itself. The top fans would be pulling some air vertically through that area, but the fins on its heatsink are aimed horizontally so it woulden't be benefiting all that much.

The reason I got the H80i and not the H100i is because the top of the case doesnt have enough room for a radiator AND and pair of fans because of the RAM slots and and CPU power plug getting in the way.


So did you try what I suggested?
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May 16, 2014 3:09:51 PM

hmmm is a bit squeezed for space at the top of the case.

You could try flipping your top fans to be intakes which would bring cool air in over the vrm's

I only did that because I have the H440 case and due to it's restricted vents on the top, intakes on the top worked better for my temps.

Alternatively, I've seen plenty people put 1 or 2 40mm case fans on the vrm's and that takes a good few degrees off the max temps.
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May 16, 2014 3:36:24 PM

Unfortunately there isn't enough room above the heatsink to fit any kind of fan, and I dont have the technical experience to install makeshift fans on my own. Also woulden't making the top fans intake mess up the case airflow and raise the ambient temp?

I did try your suggestion but any voltage below 1.365 wont survive a prime95 test. Its not that much of a voltage bump considering the stock is 1.325.

Update:
I'm gonna try and reseat my cooler when new thermal paste gets here. If I get better temps im gonna take a fan off the H80i and that will uncover the vcore so hopefully that will be good enough. If the temps arent any better im not sure what I will do.
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May 17, 2014 5:18:58 AM

"Also woulden't making the top fans intake mess up the case airflow and raise the ambient temp?"

It all depends on the case

For my case (due to the restricted airflow from its case vents), this worked best:
3 x 120mm front - intake
3 x 120mm top - intake
2 x 120mm H80i push/pull - exhaust (higher rpm than top/front)

The problem with my setup with exhaust at the top, the design of the top cover on the H440 was just recycling warm air back into the case
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a c 120 K Overclocking
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May 15, 2014 2:41:27 PM

54C Prime 95 is V good. Idle its way too hot. gaming is OK
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May 15, 2014 2:57:43 PM

i7Baby said:
54C Prime 95 is V good. Idle its way too hot. gaming is OK


When I tried pushing it further I was starting to get warnings from my motherboard saying the vcore was getting too hot. During normal use it only goes up to 60c but when prime95 was running trying to hit 4.8 it was going as far as 80c.
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a c 120 K Overclocking
a c 398 à CPUs
May 16, 2014 12:08:01 AM

60C for gaming is a bit hot. Non-gaming (normal use) its waaaay too hot. Back off voltage 0.01v, spin up fans
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May 16, 2014 1:31:52 AM

What case do you have, how do you have the case fans setup and how many fans?

I've got the same mobo and cooler and when stress testing my vrm's never get over 65C @ 4.8ghz 1.48v
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May 15, 2014 2:38:27 PM

Sorry for the delay here I forgot to allow email notifications. With it clocked up to 4.7 and the voltage at 1.36v the temp has been going as high as 54c. I'm waiting for some MX-4 thermal paste to arrive so I can try reseating the cooler. If I get a better temp im gonna try and aim for 4.8. Heres my ram I have all its settings on standard:

http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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a c 120 K Overclocking
a c 398 à CPUs
May 16, 2014 1:26:32 AM

Did you - " Back off voltage 0.01v, spin up fans"? Any better?
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May 17, 2014 12:19:50 PM

I played around with a 92mm fan from my old computer and use some zip ties to get it tight on there to blow air right down onto the vcore (used it because its 4 pin). vcore 1 temps dropped by a good 15c and under the cpu in temp now. I might eventually try and get a dust filter to put on it but that solves that problem now onto the main issue.

blockhead78 said:
4.6ghz and beyond can be problematic on the 8350 depending on the quality of the chip.

Some people can hit huge voltage/temp walls all of a sudden.

However, you seem to have a decent chip if you've got 4.7ghz @ 1.37v stable

When you mentioned not being comfortable with the temps you reach at 4.8, what kind of temps are we talking about?

As long as you're within 62C core and 72C socket, then it's fine.

My 8350 runs stable at 4.8 @ 1.48v. Under load max core 49C socket 58C


Most of my previous research on the FX-8350 has said that 62C core is actually its critical temp and that I should stay under 55C.
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