new build done 3900x 4200mhz all cores

Marcdaddy

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Feb 21, 2003
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so I got my new build done my 3900x is sitting all cores 4200mhz @ 1.275v and corsair h100 for the cooling. Idle Temps are hi 30s and in Cinebench 70c. Games are only in the 50s, My question is just leave it or is it better to just focus on higher overclocks for a couple cores and leave the rest. Im mostly gaming. Really impressed so far but honestly for gaming with my 2080ti it doesn't feel any different then my 6850k but I figured so much. I do love the 3 m.2 drives I'm running.
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Dan_D

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You may find that letting the CPU boost on it's own and adding autoOC into the mix may provide faster performance in gaming. I've seen some back and fourth on that depending on the game. It also depends on the model. The lower end parts like the 3600X and 3700X seem to benefit more from manual overclocking due to their lower boost clocks. The 3900X and 3950X benefit less from doing that outside of a few rare applications and games.
 
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You may find that letting the CPU boost on it's own and adding autoOC into the mix may provide faster performance in gaming. I've seen some back and fourth on that depending on the game. It also depends on the model. The lower end parts like the 3600X and 3700X seem to benefit more from manual overclocking due to their lower boost clocks. The 3900X and 3950X benefit less from doing that outside of a few rare applications and games.

How high will the auto boost go if the game is only using 4 cores?
 

Dan_D

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How high will the auto boost go if the game is only using 4 cores?

The boost clock rating for a 3900X is 4.6GHz. The CPU is incapable of clocking more than one or two cores to that high of a speed. It isn't a matter of not being able to do that many simultaneously, but rather the CPU only having one or two cores good enough to overclock that high in the first place. I can't give you a concrete answer as it will vary greatly as a lot of variables impact the result. However, it is possible that you could end up seeing numbers higher than 4.2GHz on four cores. This is where I've said that your results from manual overclocking vary. The more heavily threaded a game is, the more it could benefit from a manual overclock.

In testing, I found games like Hitman 2 and Shadow of the Tomb Raider to benefit from a manual overclock at 4.3GHz. However, other, more lightly threaded games benefit more from being left up to PB2+AutoOC. Because this often leads to questions about PBO vs. PB2, I'll go ahead and throw it in there. PBO results are hit and miss. Generally it seems more effective on the 6 core or 8 core parts. The 12c/24t and 16c/32t parts don't seem to benefit from PBO at all. In some cases, PBO actually performs worse on those chips than PB2 does. Theoretically, you can add a 200MHz auto-OC to PBO for a total of 4.9GHz on a 3950X but in reality, you'll never see clocks beyond 4.7GHz if you see that at all.
 

Marcdaddy

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Ok so I tried Ryzen Master game mode 6 cores at 4500mhz yields great result over a all core 4200mhz overclock in games. Killing extra for in Division 2 and borderlands 3at ultra settings on my shiny new LG 38inch moniter.
 

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GotNoRice

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Really impressed so far but honestly for gaming with my 2080ti it doesn't feel any different then my 6850k but I figured so much.

Yeah I went from a 5820k @ 4.5Ghz to a 3900x and also did not notice much improvment in terms of gaming. It is nice that it seems to put out less heat despite having double the cores.

Looks like a nice build overall, but I've never personally understood the appeal of the My Little Pony color theme.
 

Dan_D

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Yeah I went from a 5820k @ 4.5Ghz to a 3900x and also did not notice much improvment in terms of gaming. It is nice that it seems to put out less heat despite having double the cores.

Looks like a nice build overall, but I've never personally understood the appeal of the My Little Pony color theme.

Unfortunately, you won't notice much if any improvement on the gaming front. AMD has caught up to and slightly surpassed Intel's IPC, but the design of Zen2 falters slightly on the gaming front compared to Intel. The exact reasons for this are complicated, but its due to several factors. To combat this, AMD threw a crap ton of cache memory at their CPU's, which really did close the gap significantly, but it's still there in some games.

I ran a 5960X @ 4.5GHz for almost five years and the upgrade bug bit me pretty hard. I ended up running an AMD Threadripper 2920X which was a step backwards in gaming performance. I switched to a Core i9 9900K, which was a step backwards from the Threadripper everywhere but gaming. I did run a 10980XE briefly, but I shipped that CPU off to David for our AIO testing setup. I'm now running a 3950X, which seems to be the best balance of price and performance. It isn't much of an upgrade from my 5960X on the gaming front, but I haven't really noticed much of an impact from switching from the Core i9 9900K to the 3950X. My games are smooth as ever and multitasking and everything else I do are better than ever.

Even though the Core i9 10980XE was faster most of the time, the difference isn't huge. Not only that, but the 10980XE made my office much warmer than the Core i9 3950X does. While benchmarking, I've seen the 10980XE hold temps just under 110c which is its throttle point. That was with no-AVX offset @ 4.7GHz, but you get the idea. It didn't run that hot normally, but it still seemed to have warmed my office more than this 3950X does.
 

kamikazi

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I'm not sure how much this will help you, but here's the thread I did when I binned two 3900x chips. I tested lots of different voltages and all core overclocks up to 4.3 GHz. I wasn't measuring gaming performance, I was running CB20 for 300 seconds. Binning 3900x chips.
 

crazycrave

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I can only add that I run a 3600 in auto overclock and it uncaps the 4.2Ghz limit .. In most games in runs above 4.2 all core as temp controls the boost .. Fortnite runs a little lower clocks then other games do .

 
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