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Which overclocks better 7900x or 7920x

post #1 of 33
Thread Starter 
I want to build a machine with one of these but cant quite tell which is better for reaching high single core clocks. There is some theory that the larger 7920 die can be cooled better but i am not sure if this is true.
post #2 of 33
Hi,
Both double as space heaters unless one delids them which wipes the Intel warranty
So be aware of that oc'ing is sort of limited on all x series including Kabylake too.

After a delid and you still need a pretty good liquid cooling system to really oc
I've personally only gone to 4900 @74c I believe it was
https://valid.x86.fr/tzfeen

Before I was hitting thermals of 97c at only 4644. or 46 all core on a 7900x that was using a Corsair H115i.
I now use a EK-280 performance loop kit all is in my system spec's
Edited by ThrashZone - 11/17/17 at 7:35am
     
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post #3 of 33
Thread Starter 
Thanks for the info! 74c at 4900 on all cores is not bad. I have a pretty beefy loop and I did intend to delid. Have you tried going beyond 49?
I'm mainly inserted in getting a comparison with the 7920x is it just as easy to get to 49 or harder? and will the temp be more or same. Seems like there just aren't too many people trying out the 7920 for me to get some data points.

Also have you tried clocking only 4 of the cores up?
post #4 of 33
More cores typically means maximum overclock will be lower. Typically. If you could hypothetically get one to 5.0 GHz, I don't think you would notice a difference in performance compared to 4.9 GHz.
post #5 of 33
Thread Starter 
Quote:
Originally Posted by chessmyantidrug View Post

More cores typically means maximum overclock will be lower. Typically. If you could hypothetically get one to 5.0 GHz, I don't think you would notice a difference in performance compared to 4.9 GHz.

Usually this is true but in this case there is a question because the 12 core is on a bigger die than the 10 core. So its theoretically possible that the 12 cores have more space between them than the 10 core ones and thus can dissipate heat better. The reason I'm interested in the 7920 is because the core count is almost the same but on a bigger die.
post #6 of 33
I did say "typically" twice. Even at the same clocks, I'm not sure how much of a difference you would notice between the two. Depends on the tasks. If the i9-7920X will save enough time over the life of the processor to pay for itself, it would be slightly foolish to get the i9-7900X.
post #7 of 33
Hi,
No i stopped at 4900.
There's a thread in the General Intel section that a person had a 7920x but it wasn't acting right couldn't clock anything
Not sure what they were doing wrong and wouldn't answer questions or fill in system spec's/ post screen shots... not sure they were really listening or wanting help just here to complain :/

I never tried anything but all core multiplier
I might try by core usage but doing so makes the multiplier disappear so not sure what it would do or use so I bailed on that and stuck with all core.
     
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post #8 of 33
7900X, there's two less cores of heat to remove, plus it is the highest binned of the "LCC" dies (so it uses 10 of the die's 10 cores) while the 7920X is the lowest binned of the "HCC" dies (uses 12 of the die's 18 cores).
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post #9 of 33
I have a 7920x and I'm hitting 4.8GHz stable with an EK Predator 360, which is cooling both my CPU and Titan XP. I have custom cooling parts from EK coming later this month, so I should be able to push a little further, although I haven't even tried 4.9 yet with my current cooling. I will probably not delid my CPU since I'm pretty happy with my results thus far.

I'll note that the VRMs are going to be a big factor in your OC potential since a motherboard with poor VRM cooling will likely result in throttling. As far as which CPU overclocks better, I would say the 7900X might have a slight lead based on what I've seen. By slight lead, I mean maybe 100MHz or so. Keep current prices in mind as well. I got my 7920X for $1100 from B&H. The 7900X is currently going for $960. $140 for an additional 2 cores isn't bad.
post #10 of 33
Quote:
Originally Posted by gridironcpj View Post

I have a 7920x and I'm hitting 4.8GHz stable with an EK Predator 360, which is cooling both my CPU and Titan XP. I have custom cooling parts from EK coming later this month, so I should be able to push a little further, although I haven't even tried 4.9 yet with my current cooling. I will probably not delid my CPU since I'm pretty happy with my results thus far.

I'll note that the VRMs are going to be a big factor in your OC potential since a motherboard with poor VRM cooling will likely result in throttling. As far as which CPU overclocks better, I would say the 7900X might have a slight lead based on what I've seen. By slight lead, I mean maybe 100MHz or so. Keep current prices in mind as well. I got my 7920X for $1100 from B&H. The 7900X is currently going for $960. $140 for an additional 2 cores isn't bad.

That is true, the price difference is quite small nowadays and the clock speed difference wouldn't be huge. 4.8 is excellent for 12 cores without a delid.

Also repped for Iron Maiden Eddie lol
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