CyberpowerPC Syber M Xtreme 400 Review

Early Verdict

The CyberpowerPC Syber M Xtreme 400 is a compelling option for anyone looking to tango with an X99 platform. The custom-designed chassis stands out against similarly priced competition, and the factory-overclocked graphics card and speedy memory further justifies its overall value. Although we weren't thrilled with the conservative overclock and uninspiring SSD performance, the Syber M Xtreme 400 contends with Z170 platforms with higher-clocked CPUs while offering more PCIe lanes and processing cores than the i7-6700K-equipped systems. The Syber M Xtreme 400 earns CyberpowerPC a Tom's Approved award for its unique design, competitive performance, and reasonable price.


  • +

    X99 Chipset

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    Factory-Overclocked GPU

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    Custom chassis


  • -

    Mediocre CPU overclock

  • -

    Weak NVMe SSD performance

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Introduction And Product Tour

When CyberpowerPC heard we were back in the gaming desktop review business, the company was anxious to get its Syber M Xtreme 400 in our hands, and we were excited at the prospect of testing an entry-level X99 platform against our recently-reviewed Z170 systems to see if the performance of a six-core Intel Core i7 processor and a factory-overclocked GeForce GTX 1080 graphics card could warrant the $2,200 price tag. Time to see if the Syber M makes the grade.



The CyberpowerPC Syber M Xtreme 400 features a custom-designed ATX mid-tower chassis with an angular, yet sleek appearance. For a mid-tower case, it’s sizable, measuring 18.26 x 8.66 x 20.82". It also comes loaded with aesthetic extras, including orange LEDs that adorn the optical drive bay access door and a grill underneath the front end of the case that projects the Syber logo. This chassis is unique among the other desktops we’ve tested, and you won’t find it anywhere else, except from CyberpowerPC.

The top of the case features a removable ventilated panel that gives you access to the backside of the 240mm water cooler, making it easy to clean. The left side panel window showcases an LED-illuminated PSU shroud bearing the Syber logo, with a clear view of the GPU, motherboard, and its other attached components. However, aside from the PSU shroud and GPU LEDs, the interior of our review sample lacks additional lighting, leaving the upper part of the motherboard in the dark. However, if you're partial to well-illuminated interiors, the company also offers remote-controlled RGB LED strip options for the Syber M Xtreme 400.

The rear motherboard panel sports a USB 3.1 Type-C and Type-A port (one each) capable of 10Gb/s data rates. The Type-C port also features 40Gb/s speeds with Thunderbolt 3, and it can provide video output at up to 4096 x 2304 at 60Hz. However, because the X99 platform doesn’t have integrated graphics, the motherboard comes with an adapter cable that allows you to connect one of the dedicated GPU’s DisplayPorts to the motherboard’s DisplayPort input to enable video output through the USB Type-C port. It’s a neat feature, but we can’t see many people being in a position where they would need to connect a display to a Type-C port over the GPU's DVI-D, HDMI 2.0, or three DisplayPort interfaces.

The motherboard also sports three USB 3.0 and two USB 2.0 ports, in addition to a PS/2 keyboard/mouse port. The five audio jacks (center, subwoofer, speaker-out, line-in, line-out, mic-in) and S/PDIF connector are powered by a Realtek ALC1150 codec that supports up to 7.1 channel audio. The front panel I/O consists of two USB 3.0 ports and two USB 2.0 ports, in addition to a mic-in and headphone out jack. A Blu-ray burner is hidden by an LED-illuminated swinging panel (door) that bears the CyberpowerPC logo.


The Syber M Xtreme 400 is equipped with an Intel Core i7-6800K processor, which features six cores and 12 processing threads. CyberpowerPC overclocked the CPU cores, with single and dual-core operation hitting 3.8GHz. However, engaging more than two cores will limit the CPU multipliers to 35, resulting in a 3.5GHz maximum frequency.

These aren’t huge gains by any means (the base frequency of the CPU is 3.4GHz), but the $19 Pro OC overclocking service guarantees up to a 10% gain or more, and that’s exactly what you get (around 11%, at least, with dual-core operation). An all-core clock frequency of 3.8GHz would have been considerably better, and maybe that’s what you get with the Extreme OC service, which guarantees up to 15% (or more) performance from the base CPU clock rates. However, we don’t get that treatment with this particular review sample, and we’ll have to reserve judgement until we see how the CPU tuning plays out in our benchmark suite.

The processor is seated in a Gigabyte X99P-SLI motherboard. Four of the eight memory DIMM slots are occupied with a 16GB (4 x 4GB) kit of ADATA XPG Z1 DDR4-3000 memory, with CAS timings of 16-16-16-37. The quad-channel memory controller and above-average frequency should provide excellent performance in memory-intensive workloads, despite the somewhat-standard capacity.

Loaded with an Intel Core i7-6800K, the 28 PCIe lanes running to the motherboard support up to 4-way AMD CrossFire and 3-way Nvidia SLI (900 series and below) configurations, with three slots operating in x8 mode and the bottom x16 slot operating in x4 mode when occupied. There also two PCIe 2.0 x1 slots to add a wireless or capture card. The main x16 slots also feature stainless steel shielding that reinforces the PCIe connectors with extra strength for heavy graphics cards.

The M.2 slot is loaded with a 512GB Intel 600p NVMe SSD, and the 2TB HDD is mounted in the 3.5" drive bay (which is accessible from the right side panel). This is plenty of storage for the average user, and the SSD capacity is par for the course. Further expansion options include multiple SATA 6 Gb/s ports (for a total of 10), two of which make a SATA Express connector.

The single EVGA GeForce GTX 1080 SC graphics card features a base clock of 1,708MHz and a boost frequency of 1,847MHz, which should (on paper) provide a modest performance boost in games and GPU-intensive tasks compared to graphics cards with reference (Founder’s Edition) clockrates. CyberpowerPC ships the Syber M Xtreme 400 with the latest version of the GPU, with the updated VBIOS and added thermal pads, so we shouldn’t run into the same temperature issues some were reporting with the ACX 3.0-cooled graphics card prior to the update.

The CPU is cooled by a beefy Asetek 570LXL LCS closed-loop liquid cooler, which features a 240mm radiator and a copper cooling plate. The radiator sports two of the 120mm Corsair AF120 fans, exhausting heat out the top of the case. Two more of these fans adorn the front of the chassis, which pull air from the illuminated grating on the bottom front end of the PC. There’s also a Corsair AF120 fan exhausting air out the rear, and the upgraded fans account for $63 of the bill ($24 for radiator fans, $39 for case fans).

The Syber M is powered by a Corsair CS650M 80 Plus Gold certified power supply, which is hidden by a sleek PSU shroud and features a single 12V rail with 51A of juice. Although this is plenty of power for the system as it’s configured, we’re somewhat put off by the seemingly-minimalist wattage. However, if you want to upgrade to something with more power (if you’re looking to upgrade to SLI down the line) then you’ll have to throw a little more money down.

The case’s power supply fan intake has a built-in removable filter, making it easy to clean. The semi-modular PSU’s attached ATX and CPU power cables are braided, but the modular PCIe, SATA, and molex cables are flat and smooth, so they aren’t the easiest to tuck away inconspicuously. However, CyberpowerPC’s cable management leaves the visible interior looking clean and tight. The right side panel hides the excess (and 3.5" drive bays), with everything tied up as neat as one could set it, considering the mix of PSU cables.

Software And Accessories

We’ve omitted this section in our other recent desktop reviews, primarily because those vendors didn’t ship their products with any additional pre-loaded software or accessories, such as a keyboard or mouse. CyberpowerPC didn’t do much in the way of software, but it did load the Intel Turbo Max Technology 3.0 software, which allows you to select specific programs and give them a boost in single-threaded clock frequency. However, we left this utility unaltered, and it wasn't enabled in our testing. Other than that, there isn't any additional pre-loaded software.

However, you do get a motherboard box full of the component’s manuals and accessories, including additional PSU and SATA cables, the case’s PCIe lane plates and 3.5" bay cover, multiple color assortments of rims for the upgraded Corsair fans, and that DisplayPort adapter that we mentioned earlier (to enable USB Type-C video output).

The Syber M also comes with a company-branded gaming mouse, with an LED-lit logo and multiple gamer-centric buttons. The center buttons below the scroll wheel adjust the DPI on the fly, and there are also sniper and turbo shot buttons, along with forward and backwards movement buttons near the thumb rest. Under the bottom cover, there are five weights you can remove to adjust how it feels in your hand, and the mouse is a nice bonus that doesn’t affect your price tag.

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Derek Forrest
Derek Forrest is a Contributing Writer for Tom's Hardware US. He writes hardware news and reviews gaming desktops and laptops.
  • Colin_10
    Looks like a nice rig, but honestly once you learn to build your own PC (which is very easy) there is no reason to pay the markup for this. The knowledge gained from actually building the machine yourself is more valuable than the time saved.
  • ammaross
    I'm surprised they used AF120 fans instead of the SP120 alternatives that are designed for high(er) static pressure situations (such as blowing through a radiator!). The AF120 is their "high air flow" option designed for blowing through not much more than the exhaust grill of the case, so may wear out the motor prematurely....
  • Xtreme356
    16GB (4x8GB) ADATA XPG Z1 DDR4-3000"
  • HSCarsten
    I think you guys messed up that specsheet 4*8gb is not 16gb
  • Kareem_6
    I feel what COLIN_10 is saying cuz 15 years ago, I built my own pc & thus taught myself about it. So, therefore I will never have to buy a PC again!
  • FritzEiv
    19104260 said:
    I think you guys messed up that specsheet 4*8gb is not 16gb

    Thank you (and Xtreme356). Good catch. Fixing.
  • redgarl
    It is so ugly...
  • Big_D_Design
    CyberpowerPC is my favorite among all the boutique builders. I have ordered Gaming PCs from them and for other clients of mine. They really have such a nice choice of machines for people that don't want to configure their own, or know how to get a good bang for the buck. This machine I think is very much along the lines of cutting edge goodness for the money. I personally would have the 6850 Intel Chip instead of the Intel 6800. It would be worth the extra $165 in the long run. These guy sell Gaming PCs at a fair price. I used to build PCs for a living and CyberpowerPC was also an alternative for my customers. They really charge hardly anything to build these things and you can get the exact brands of parts you want. And if it doesn't go together right.... they call you. I know, because they did that for me. Yea, you can build your own.... but go to their site and see the choices and pricing. Me like dem lots!