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Question Which is better? Ryzen 5800x vs 3900

ARESTARKH

Junior Member
Apr 12, 2021
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0
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Hello. I decided to update the system. I bought ryzen 5800x. But I was offered to swap for 3900. The 5800x has very high single-core performance and wins in games. But the 3900 is good at gaming too, and much faster in multithreading. My motherboard is Asrock b450 pro4 with bios 4.20. 32 gb ram.
 

ARESTARKH

Junior Member
Apr 12, 2021
13
0
6
I would stick with the 5800x personally. I have a 3700x and would love to upgrade to a 5800x if i had the money.
The 5800x processor is more expensive than it should be. Unfortunately, there was no version without x. The 3900 is a great processor and great performance for its price
 

Rigg

Member
May 6, 2020
189
310
96
Good catch. 5900 is also OEM only and 65w. I wonder, if you can set 65w in bios for X parts to run as cool / power efficient?
Yep, I was looking at an alienware with 5900 the other day. You can set the PPT and Temp limits to whatever you want on the x chips. I'd assume they'd slightly out perform the OEM only parts as they probably have better binned silicon.
 

blckgrffn

Diamond Member
May 1, 2003
7,696
923
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www.teamjuchems.com
I was searching some yesterday as I am hunting for a used 5800x and thought hey, might as well look for pulled 5900 oem cpus.

One searching for “non-x” is less effecient for I think obvious reasons. Second, I think they are really just now finally hitting the channel despite a January launch and non-existent essentially.

Even finding 3900s isn’t so simple, and they should be cheaper than the 3900x and easier to find than the 5900 one would think...
 

Rigg

Member
May 6, 2020
189
310
96
I was searching some yesterday as I am hunting for a used 5800x and thought hey, might as well look for pulled 5900 oem cpus.

One searching for “non-x” is less effecient for I think obvious reasons. Second, I think they are really just now finally hitting the channel despite a January launch and non-existent essentially.

Even finding 3900s isn’t so simple, and they should be cheaper than the 3900x and easier to find than the 5900 one would think...
I was considering buying a Dell AW with 6800xt and 5900 to pull and use in my setup. Having had no experience with OEM only CPU's I'm worried my x570 board won't recognize the CPU and its like another $350 to go with the 5900x for some reason.
 

blckgrffn

Diamond Member
May 1, 2003
7,696
923
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www.teamjuchems.com
I was considering buying a Dell AW with 6800xt and 5900 to pull and use in my setup. Having had no experience with OEM only CPU's I'm worried my x570 board won't recognize the CPU and its like another $350 to go with the 5900x for some reason.
I think it would maybe work. Isn't a ton of the microcode stuff in the blob AMD provides? What's your board?

I just checked mine and it's not listed, but the 3900 is? I would think that as the IBUYPOWER and the like start getting them we will see them in enthusiast board supported CPU lists too...

Be our guinea pig :D
 
Last edited:

Rigg

Member
May 6, 2020
189
310
96
I think it would maybe work. Isn't a ton of the microcode stuff in the blob AMD provides? What's your board?

I just checked mine and it's not listed, but the 3900 is? I would think that as the IBUYPOWER and the like start getting them we will see them in enthusiast board supported CPU lists too...

Be our guinea pig :D
I'm not 100% sure but I think the AIB's have some control over what CPU's are or are not supported in a given BIOS version. I have an Asus Crosshair VIII hero. I also think it will probably work fine but it's a bit of dice roll.

When I checked the other day several OEM only CPU's where listed as compatible with my board but not the 5800/5900.
 

Shmee

Memory and Storage, Graphics Cards
Super Moderator
Sep 13, 2008
4,998
825
126
My vote between the two would be for the 5800X.
 

Shmee

Memory and Storage, Graphics Cards
Super Moderator
Sep 13, 2008
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I am not sure, but I think it may depend on the workload. At stock, the 3900 is rated for 65W TDP and the 5800X is 105W TDP, I believe. As mentioned, you can generally adjust this in BIOS.
 

Magic Carpet

Diamond Member
Oct 2, 2011
3,320
110
106
Does the 5800x consume less power than the 3900?
Unless you put it into ECO mode, it will consume way more power. 5800x has the highest default vcore of all the 5000 series processors.

However, from what I've read, you will need to use Ryzen Master along with the right bios settings to accomplish that.

Also, 5800x at stock runs a bit hot, so you would want a good cooling solution for it to maintain its peak performance at all times.

The only convenience of 3900 is the 65w TDP without any bios/software manipulation which could be an advantage in certain scenarios.

At any rate, I would only swap 5800x for 3900 for a price, no way 1 for 1. ST / Gaming performance on it is very good, even with all the cons, I've mentioned above. Or just sell it, and get something else, like maybe 5900(x) or 5950x, if you can find a good deal.

NB 5950x has the best silicon, temps, and power efficiency. This is MY pick. Still waiting for a good deal on it, however.
 
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ARESTARKH

Junior Member
Apr 12, 2021
13
0
6
Unless you put it into ECO mode, it will consume way more power. 5800x has the highest default vcore of all the 5000 series processors.

However, from what I've read, you will need to use Ryzen Master along with the right bios settings to accomplish that.

Also, 5800x at stock runs a bit hot, so you would want a good cooling solution for it to maintain its peak performance at all times.

The only convenience of 3900 is the 65w TDP without any bios/software manipulation which could be an advantage in certain scenarios.

At any rate, I would only swap 5800x for 3900 for a price, no way 1 for 1. ST / Gaming performance on it is very good, even with all the cons, I've mentioned above. Or just sell it, and get something else, like maybe 5900(x) or 5950x, if you can find a good deal.

NB 5950x has the best silicon, temps, and power efficiency. This is MY pick. Still waiting for a good deal on it, however.
What about vrm requirements?
 

Iron Woode

Elite Member
Super Moderator
Oct 10, 1999
28,539
8,546
136
Personally, I would go for the 5800x and get yourself a decent x570 board like the Asus Prime X570-P.

Best vrms on a budget board and even when compared to high end boards it is near the top.

 
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Magic Carpet

Diamond Member
Oct 2, 2011
3,320
110
106
What about vrm requirements?
Ryzen is very smart, with the better VRM layout you would be able to sustain higher boosts and for longer. It won't kill your mobo, like in the AM3 3+1 w/ 125/140W CPUs days. So, fear not. It will be fine, even without ECO mode.

Watch this video as another layer of info. It's a bit of PR, but still very informative.
 
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DrMrLordX

Lifer
Apr 27, 2000
17,112
6,118
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What about vrm requirements?
All of AMD's CPUs with a 105W TDP consume the same maximum sustained (and burst) amount of power running board defaults: 142W. Any motherboard that supports a Zen2 or Zen3 CPU with TDP of 105W supports them all, at least VRM-wise.
 

amrnuke

Golden Member
Apr 24, 2019
1,157
1,724
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What about vrm requirements?
The B450 Pro4 can supply 100A current to the CPU. This easily supplies 5800X and 3900X. You could probably o/c both with some more robust airflow over the VRMs as well.

My opinion: If you're not going to overclock and not going to see benefit to PCIe 4.0 in your workflow, don't waste your money on changing the motherboard.
 
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