Ryzen 5900X or 3900X? Worth upgrading?

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AMD’s new Ryzen CPUs seem to be a smash hit. If you can find one, much like all launches in 2020 that can be difficult, they are crushing Intel even in gaming, and powering through their last gen counterparts too – but how good are they? If you have a 3900X, is it actually worth upgrading to a 5900X? Or if you are building from scratch is the new 5th gen chip worth the extra cash? Lets test them and find out. 

We’ve all seen AMD’s slides, 19% IPC improvement, faster in 1080p gaming than a 10900K, and a good performance uplift across the board elsewhere. But that’s press materials, not the real world, so how does it hold up? Really well. We will go into detail in a second, but to give you the headlines, you get 20% more single threaded performance, 15% more multithreaded, and up to 20% more FPS in games at 1080p. It’s amazing. But I picked my wording carefully there.I said “up to 20% more FPS”, because in the games I tested, it ranged from within margin of error, to 5%, 10% and 22% more performance, so it really does vary.

A quick note about my testing setup, since I don’t have a 3080 or 3090, and the 3070 I do currently have is the non-OC one from ZOTAC, I’m using the same 2080ti I’ve used for the last year or two for benchmarks. That means while I can’t publish my old results as comparisons, I can use them to roughly gauge how it fairs. I’m using the latest BIOS version available for the B550 Steel Legend motherboard, 1.52, 3600MHz CL16 RAM, and the latest 457.30 driver from NVIDIA. Sorted? Great, lets look at the numbers.

COD MW	5900X	3900X
1080p AVG	175.98	171.02
1% Low	140.4494382	138.5041551
1% Low ms	7.12	7.22
1440p AVG	132.87	131.62
1% Low	107.4113856	110.619469
1% Low ms	9.31	9.04
4K AVG	80.9	80.38
1% Low	66.62225183	68.58710562
1% Low ms	15.01	14.58

BFV	5900X	3900X
1080p AVG	172.74	155.2
1% Low	150.3759398	128.7001287
1% Low ms	6.65	7.77
1440p AVG	135.19	132.46
1% Low	114.1552511	113.3786848
1% Low ms	8.76	8.82
4K AVG	81.17	82.52
1% Low	68.63417982	72.93946025
1% Low ms	14.57	13.71

FORTNITE	5900X	3900X
1080p AVG	208.16	171.2
1% Low	131.5789474	103.626943
1% Low ms	7.6	9.65
1440p AVG	141.94	120.59
1% Low	101.2145749	82.3723229
1% Low ms	9.88	12.14
4K AVG	73.37	62.77
1% Low	57.7700751	47.82400765
1% Low ms	17.31	20.91

Watchdogs Legion	5900X	3900X
1080p AVG	87	83
1% Low	68	62
1440p AVG	69	69
1% Low	57	57
4K AVG	44	44
1% Low	37	37

As for productivity, it’s a much, much clearer victory. Across the board, it’s 15 to 20% faster both in single and multithreaded tasks, although in more “real” workloads like Blender and Premiere Pro don’t always have quite as astonishing a lead.

	5900X	3900X
Premiere Pro (s)	313	349
Blender BMW (s)	113	119
Gooseberry (s)	565	680
Cinebench R20 1T	625	516
Cinebench R20 nT	8063	7020
Cinebench R23 1T	1603	1317
Cinebench R23 nT	20769	17893

So by all accounts, the 5900X is a better CPU but there’s a catch. It costs £560 here in the UK, which is nearly £200 more than the 3900X, or over £100 more than it’s slightly faster counterpart, the 3900XT, and if I’m honest, I’m not sure it’s worth that price difference. Especially compared to the 3900X, an extra £200 is the difference between a 3070 and a 3080, which is a much more surefire way to get much, much more performance in games.

For around £50 more you can buy a brand new 3950X instead, netting you 4 more cores and a pretty similar gaming experience, although not quite as fast, but if you are buying these kind of CPUs over the 6 and 8 core variants, I would assume you are doing some sort of productivity work alongside gaming, making the extra cores count for a lot more than a couple FPS in games.

If you’ve already got a 3900X, you don’t need to upgrade. This is a brilliant chip, but the performance gap likely isn’t enough to make you want to upgrade to this, over a 3950X instead. Since the AM4 platform is end-of-life as of these chips coming out, you can always hold out for a while and pick one up when prices drop later. If you are building a new system and have to choose between the two, at current pricing the 5900X is a little hard to recommend. It does have a convincing lead over the 3900X, but the price gap is a little hard to ignore.