Question Questions regarding recent install of Ryzen 7 5800X

[tomseurocat]

I just installed an Ryzen 7 5800X since I can't go any newer without upgrading my MoBo as well. I have a couple of questions.

1. The stock speed of this CPU is 3.8GHz and it is now running at over 4GHz as shown in the attached photo. I don't understand why since I haven't overclocked anything. Would there be some kind of setting for a variable speed that I don't know about?

2. Was the Ryzen 7 5800X a good choice or should I have bought the 5700X? I've heard some issues concerning temps although I haven't noticed anything.

3. This really has to do with my RAM sticks. When I purchased my RAM I specifically ordered 3200 sticks thinking that they would run at that speed. I've had 3 different CPU's in this rig and they continue to run at 2133. Why wouldn't they run at the speed that they are capable of hitting without the need for changing that in the BIOS?

https://imgur.com/P5yfvDZ

Thanks for the help!

 

[hotaru.hino]

1. The stock speed of this CPU is 3.8GHz and it is now running at over 4GHz as shown in the attached photo. I don't understand why since I haven't overclocked anything. Would there be some kind of setting for a variable speed that I don't know about?

The CPU overclocks itself up to 4.7GHz depending on the workload. The fewer cores are needed for said workload, the higher it'll go.

2. Was the R7 5800X a good choice or should I have bought the 5700X? I've heard some issues concerning temps although I haven't noticed anything.

That depends entirely on what you value.

3. This really has to do with my RAM sticks. When I purchased my RAM I specifically ordered 3200 sticks thinking that they would run at that speed. I've had 3 different CPU's in this rig and they continue to run at 2133. Why wouldn't they run at the speed that they are capable of hitting without the need for changing that in the BIOS?

RAM speed configuration comes from the motherboard, which tells the memory controller what to do. It defaults to a lower speed because that's more or less guaranteed to work.

 

[tomseurocat]

Would setting it to 3200 in the BIOS cause micro stuttering in my game recordings? Or how much performance difference would there be between 2133 and 3200?

 

[hotaru.hino]

Would setting it to 3200 in the BIOS cause micro stuttering in my game recordings? Or how much performance difference would there be between 2133 and 3200?

Though this is average frame rate. It may affect the 0.1% lows more noticeably.

Either way, it's performance you're losing out on.

 

[MEMOFLEX]

RAM speed are quite important to get the most out of the ryzen cpus. If you are running at 2133 you will be leaving a chunk of performance on the table. This will vary from game to game or application to application though ranging from severe to minor.

In you BIOS you should have the option to enable XMP or DOCP which should run your RAM at the advertised 3200 speed. Can you confirm what exact model of RAM you are using and how many modules? I assume they are matched pairs?

 

[Misgar]

2133MT/s is a default JEDEC DDR4 speed, pretty much guaranteed to POST in any motherboard.

3200MT/s is an XMP/DOCP/EXPO memory overclock speed, which has to be set by the user in the BIOS. This speed usually works OK on your CPU, but occasionally makes the system unstable.

If you are using just two DIMMs and set the memory overclock to 3200MT/s, you should be fine with the 5800X which is rated up to DDR4-3200.

if you have four DIMMs installed, the Integrated Memory Controller may object to the additional load and you might not achieve 3200MT/s without some manual tweaking.

The maximum operating temperature of the 5800X is 90°C (according to CPU World but it might be 95C for the non X3D variant) and it'll sit there all day quite happily, under a heavy load. Modern chips are designed to run hard and boost up to the maximum operating temperature, to extract every last ounce of performance.

If you fit a bigger heatsink, Modern CPUs still boost up to exactly the same temperature, but you may find the processor runs a few tens or hundreds of MHz faster, with the extra cooling.

Although the TDP rating of the 5800X is only 105W, the PPT rating is 142W, so I'd be inclined to fit a cooler rated at 150W+. It's doubtful you'll ever reach 142W, unless you're running benchmark or stress tests.

On a recent video render, my 7950X sat at a constant 89°C for 36 hours. Its max temp rating is 95°C. The GPU sat at 90C and the rig is still working fine after similar long rendering sessions.

For an older rig, I chose a 3800X instead of a 3700X, because it was guaranteed to run faster out of the box, without the need for overclocking. An overclocked 3700X could usually reach the same speed as the 3800X, but I was reluctant to buy a slower binned chip, in case I didn't win the Silicon Lottery and got a bad example. I don't think you made a bad decision with the 5800X.

 

[Kona45primo]

For the ram, confirm they are in the correct locations. You'll want to try and use the DOCP. Settings instead of just bumping up to 3200 as it will likely reduce other timings as well.

Make sure you have the latest bios

5800x can run hotter than a 5700x but it should be a better binned chip. You can play around with core optimizer in Ryzen Master or just set it to eco mode which essentially turns it into a 5700x