The Best $4,000 Dream Machine Mini-ITX Gaming PC Build – September 2021

By Ari Altman | Published September 1, 2021 | Updated September 1, 2021

Sliger S620Build the Mini-ITX Gaming System of your Dreams!

If you want to build a dream gaming system, but can’t stand the idea of having another huge desktop by your side, stop dreaming and jump into a new reality! This build has all the power you could want, packed into an awesomely-compact high-end chassis. It’s everything you want in a PC, and nothing you don’t!

This Month’s Build, Powered by AMD!

For September 2021, the $4,000 Dream Machine Mini-ITX Gaming PC Build offers the best of the best… what else would you expect?!? It starts with our favorite ITX chassis ever, the highly-refined Sliger S620. It’s tiny at just 16.3L and yet can hold the highest-end gear you could ever want in a PC!

Of course, this build’s strengths go more than skin deep; inside it’s packing the insanely-powerful AMD Ryzen 9 5950X, a 16-core, 32-thread CPU that puts everything Intel offers to shame. It’s joined by an AMD Radeon RX 6900 XT 16GB GPU for extreme gaming potential, which likewise puts the heat on Nvidia’s best. This build is also packing a 2TB PCIe Gen 4 drive sporting transfer speeds of over 7,000MB/s, plus 32GB of DDR4-3600 RAM. To keep things cool, this system uses a 240mm liquid CPU cooler, offering immense cooling capacity along with low noise operation. Powering the system is a quiet and ultra-efficient 750W Platinum-rated power supply. Learn more about this build and post your questions in our full review of the unique Sliger S620 case!

Parting Thoughts

We list all of our top picks to accessorize your Dream Machine in the optional products section later in this guide, including our personal favorite keyboard, mouse, and headset. To support continued development of this guide, please use the links we provide in the guide. For readers in the US, we list either Amazon or Newegg links, and our Amazon links will auto-convert for readers in Canada, the UK, and parts of the EU, with automated substitutions made by region where necessary.

Required Components

  • CPU

    AMD Ryzen 9 5950X


    AMD unleashed a beast with the 5950X, the ultimate CPU. Offering up 16 cores and 32 threads of Zen 3 goodness, it’s packing in extreme processing power that puts anything and everything that’s come before it to shame!

    The Guru’s Tip

    It took nearly 9 months after launch for this CPU to actually become available, but now all of its power can be yours!

  • Motherboard

    ASUS ROG Strix X570-I Gaming @Newegg


    This is the very best AM4 motherboard ever released in the ITX format. It features 8+2 power stages, dual PCIe Gen 4 M.2 slots, eight USB ports (including a Type-C port), Intel Gigabit LAN, 802.11ax wireless networking, and high-end SupremeFX S1220A audio.

    The Guru’s Tip

    Asus also has the best software suite of any motherboard manufacturer.

  • Video Card

    PowerColor Radeon RX 6900 XT Red Devil Ultimate @Newegg


    Long name, but this one’s earned it! Step into gaming today with a video card that puts Nvidia non-existent GPUs to shame, the RX 6900 XT Red Devil Ultimate from PowerColor. Clocking in at a boost frequency of 2425MHz, this massively-overclocked card can take on any game and put up amazing framerates! Plus, the custom triple-slot, triple-fan cooler looks great and works even better! Sure, the price is above the original MSRP, but everything’s been reset by the cryptocurrency mining craze, and this is a card that makes an RTX 3090 tremble!

    The Guru’s Tip

    This card comes in at 12.6" long, allowing it to just slip into the case we recommend, which has a 12.7" limit.

  • Memory

    Crucial 2x16GB Ballistix DDR4-3600 C16 Black

    For this build, you need lots of high-speed RAM, and this 32GB DDR4-3600 kit will do the trick! It not only offers a high frequency, but also has tight 16-18-18 timings that most other 3600 kits can only dream of.
    The Guru’s Tip

    With 32GB on board, you'll be set for a long time to come, but if you're feeling feisty, you can always max out your system with the 64GB kit available on the same product page!

  • Solid-State Drive

    Samsung 980 Pro 2TB

    For primary storage, you don’t just want high-end, you want ultra-high-end, and that means going for the 980 Pro PCIe 4.0. It offers mind-blowing performance, up to 7,000MB/s, along with tremendous capacity, in a single package!
    The Guru’s Tip

    While you don't really need a PCIe Gen 4 drive for gaming, this is the dream machine, so of course you want it!

  • Power Supply

    Corsair SF750


    Offering a tremendous 750W of power output and Platinum-rated efficiency in an ultra-compact package, Corsair’s SF750 sets the standard for ultra-premium SFX power supplies!

    The Guru’s Tip

    Note that the case we recommend really does need a power supply this small; even SFX-L units are a bit too big.

  • Case

    Sliger S620 Mini-ITX

    Sliger hand crafts its unique Small Form Factor cases in Sparks, Nevada, and every one is built to order. No matter what color or materials you choose and how you accessorize your case, it will carry with it the DNA of a truly exceptional SFF case. Coming in at under 16.5L, it can fit the highest-end components, and it’s even relatively easy to build in, which is not true of most SFF cases.
    The Guru’s Tip

    You can learn all about this case in our full review linked at the top of this guide!

  • CPU Cooler

    Thermaltake ToughLiquid 240 ARGB


    To keep the a powerful CPU cool, we recommend nothing less than this 240mm liquid cooler, which will provide exceptional performance thanks to its dual ToughFan 12 fans, among the very best radiator fans we’ve ever tested!

    The Guru’s Tip

    While a 280mm cooler theoretically fits in this build based on the case's specs, we found that it's very hard to install, so we're recommending an ultra-premium 240mm model instead.

  • Operating System

    Windows 10 Home USB Flash Drive

    Windows 10 was a big step up from Windows 8.1, and Microsoft continues to support Windows 10 users not only with regular security updates, but with major content releases every six months. And the USB version installs in under 5 minutes, meaning you can get right into using your system!
    The Guru’s Tip

    Windows 11 is launching later this year and will be a free upgrade for owners of Win10.

Optional Products

  • The Typist's Gaming Keyboard

    Logitech G915 Wireless Mechanical Gaming Keyboard (Clicky) @Newegg

    Best. Keyboard. Ever. And the only wireless mechanical keyboard with full RGB lighting on the market. This thing is a dream come true, so sleek, so responsive. Honestly, it’s in a class of its own.
    The Guru’s Tip

    We use this as our daily driver, and wouldn't trade it for anything!

  • The Ultimate Wireless Gaming Mouse

    Logitech G502 Lightspeed Wireless


    Logitech designed the G502 Lightspeed Wireless to be the ultimate technological tour de force in the gaming mouse industry. Featuring a mesmerizing 25K Hero sensor, tunable weights, RGB lighting, and the best wireless connectivity, it is impossible to beat. And you can even upgrade it to ultra-elite status with the optional PowerPlay charging mat, which allows you to use it forever without stopping to charge thanks to the exclusive wireless charging capability!

    The Guru’s Tip

    We've used this mouse since the day it launched and have never looked back!

  • The 34-inch Widescreen Monitor

    LG 34GP83A-B


    LG has leapfrogged the competition in the gaming monitor space thanks to its clearly-superior tech. It’s definitely learned a thing or two from making the best TVs in the world! The 83A offers the very best specs you’ll find in its class, namely a 34” 3440 x 1440 curved Nano IPS panel with an amazing 1ms response time, an amazing 160 Hz refresh rate, DCI-P3 98% Color Gamut, and VESA DisplayHDR 400 certification. It’s of course equipped with AMD FreeSync Premium, which works with both AMD and Nvidia GPUs.

    The Guru’s Tip

    While "4K Gaming" is still a buzzword, the best test is in ultra-wides by a longshot!

  • The Deluxe PC Headset

    Corsair Virtuoso Wireless Headset

    Combining ultra-high-end performance with incredible comfort, this wireless headset from Corsair is the ideal all-day companion for listening to the latest market news. This headset also has an audiophile-grade microphone, perfect for teleconferencing.
    The Guru’s Tip

    This is the headset we use every day for hours at a time, and it never lets us down!

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