Ryzen 9 9900X3D

AMD

Ryzen 9 9900X3D

49.7/100
23 Reddit opinions

RedDB rating based on Reddit opinions

12 positive1 neutral10 negative

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New Build after 5 years. Need Advice.

You’re overpaying on almost every component, some of which don’t provide any better performance or actually perform worse in games than alternatives (ex. The 9900X3D - the 9800X3D performs better and is cheaper; with the 9900X3D only has the 3D cache on 6 cores, so in essence you’re paying more for

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fuddyduddyc in r/PcBuild

April 17, 2025 at 11:33 AM

150

First time building a PC

Same performance almost 500 pounds saved. Psu is A-tier cybernetics lab tested and available at Amazon. If it's for pure gaming you can swap the cpu to a 9800x3d and ram to 32gb and save a bunch more money: https://uk.pcpartpicker.com/list/PF3V7w PCPartPicker Part List Type Item Price CPU AMD Ryzen

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GeekyNick91 in r/PcBuild

April 29, 2026 at 9:53 AM

10

First time building a PC

It's not a good build. Much of it is excessive for the sake of being excessive. A 9800X3D has 8 fast cores. A 9900X3D has 6 fast and 6 slow cores. For gaming, if the game runs on the fast cores you get good performance, if it runs on the slow cores you don't. As a result with a 9800X3D: The game is

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aminy23 in r/PcBuild

April 29, 2026 at 11:01 AM

6

Looking for people to double-check a build I'm speccing out for a friend, approximately $2500 USD budget

Too much brand tax. Needlessly expensive motherboard. CPU cooler choice is "meh". SSD is PCIe5 but kind of a low-end spec and only 1TB. 9900X3D is a "meh" CPU overall. This is cheaper, the storage space is doubled (and likely faster despite being PCIe4), power supply is better made and cheaper, RAM

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psimwork in r/buildapc

August 3, 2026 at 4:45 PM

2

New build pc for creative work £2k-£2.5k

Here is a suggestion. Some re-allocation of money around to various parts. Upgraded the CPU a bit and went for the best performing AIO on the market today. Faster RAM at CL30. Toned down the motherboard slightly because I think you will find the X870 has either the same or better features than the B

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Latter-Reference3820 in r/buildmeapc

January 24, 2026 at 11:07 AM

2

Help me build a pc

I'm sure prices will be different by you, but this gives you a guide to what I would do in your position. For the CPU, I picked the 9900X3D. It's got x3d gaming speed, but 12 cores to help render loads. There's a 360mm rgb aio and a motherboard with wifi and extra M.2 & DIMM slots for future upgrade

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gamblodar in r/buildmeapc

February 22, 2026 at 6:16 PM

2

fluent with... intel or amd?

Yes and no. You need a specific algorithm to take advantage of that. If you use OpenFOAM or COMSOL which does not limit the total number of core you can use, 265k should be better. For ANSYS, if you don't have HPC, you stuck at 4 cores. In this case, 9900X should be faster. The reason 265K is faster

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Popular-Function-533 in r/CFD

November 2, 2025 at 2:51 PM

2

My Newest PC Gaming/Video Editing Rig - Any Suggestions/Help?

There's nothing I like about this build given the context. $5,000 AUD = $3,200 USD and you're getting an 8 core non-X3D with a 9070XT; if expect that for half the price. 6000CL30 RAM is what I'd expect in a PC 1/3 the price. X870 can't handle 2 SSDs at full speed without slowing the graphics card do

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aminy23 in r/buildapc

August 1, 2025 at 3:51 AM

3

i'd like some build feedback & help with a cpu cooler!

This only saves you 70 pounds, but I'm including an upgrade to a 5080 - you can roll that back and save ~300+. Oh, we also went up to 48GB RAM for ~25 pounds, because we're no longer paying the 6000/30 tax. The 270K+ is a little worse than the 9950X, but it's very close I run AM5, but the only way I

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Borigh in r/buildapc

July 15, 2026 at 9:34 PM

1

Hi, looking for a hybrid pc

PCPartPicker Part List Type Item Price CPU Intel Core Ultra 5 250KF Plus 4.2 GHz 18-Core Processor €219.80 @ Neobyte CPU Cooler Thermalright Phantom Spirit 120 SE ARGB 66.17 CFM CPU Cooler €33.15 @ Amazon Espana Motherboard ASRock B860M Pro-A WiFi Micro ATX LGA1851 Motherboard €146.10 @ reichelt ele

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canyouread7 in r/buildapcforme

July 9, 2026 at 4:06 AM

1

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