MSI's flagship motherboard for HEDT the X299 XPower Gaming AC. The XPower Gaming AC pulls from its overclocking and enthusiast pedigree as well as including features more focused on gaming, designed to attractive to an even broader audience. MSI also focuses on storage, including U.2 support and the ability to use five M.2 devices out of the box. 

MSI X299 XPower Gaming AC Overview

Previous generations of MSI XPower models were primarily focused on extreme overclocking and enthusiasts looking to wring every last MHz out of their CPU. The boards were designed with enough power delivery to be able to handle just about anything thrown at it, as well as some overclocking only accessories. As time has moved on, we have seen the line start to blur the markets between overclocking, enthusiasts, and gaming, and now we have crossover boards, such as this one, which combine the feature sets. 

The X299 XPower Gaming AC has a total of four full-length PCIe slots supporting up to 4-Way SLI/Crossfire. The M.2 slots are found in between the PCIe slots, each with their own heatsink. If three M.2 slots are not enough, MSI includes an add-in card for two additional x4 PCIe 3.0 M.2 slots for a total of five. Unique to certain MSI boards, the top M.2 heatsink is hinged at the base with the chipset heatsink and is held in place by a tab which slides to release. The heatsink is designed to be more robust than the other two slots and potentially do a better job cooling. All that being said, the first two M.2 slots are powered by the chipset: only the third M.2 slot uses PCIe lanes from the CPU. In addition to the M.2 slots for storage, the XPower Gaming AC has a U.2 port (also from the chipset) and a total of 10 SATA ports with eight fed from the chipset and two from an ASMedia controller. 

For the overclockers, MSI implements a couple of very useful features, especially when pushing the limits. In the upper right-hand corner, by the debug LED, are plus and minus buttons used to overclock either BCLK and CPU Ratio while in Windows. Right around that area are voltage read points which cover the major voltage domains including Vcore. It also has jumpers to force enter the BIOS bypassing errors, a dual BIOS, and even a slow mode switch used to get through POST at a low clock speed increasing stability when using liquid nitrogen and extreme overclocks. 

Performance on the XPower Gaming AC was good all around with it landing in the top half of results in nearly all testing. Its power use results were a bit higher than most boards we have tested, in our long idle and OS idle testing, but only by a few watts did it miss the bell curve. Load power found itself back with the other set of boards we tested, but still on the bottom half looking up at more efficient boards. Boot times were also on the trailing side of average but did manage to be the second fastest (of five) MSI X299 boards we tested. It seems the MSI boards settle a tick or two slower than most other boards in our POST time tests. 

In the way of USB connectivity, the XPower has USB 3.1 (10 Gbps) Type-A and Type-C on the rear panel, with ports run from the latest and more efficient ASMedia 3142 controller. In addition to the rear panel, the motherboard does have a header for front panel USB 3.1 (10 Gbps) as well. An ASMedia 1074 hub controls six USB 3.1 (5 Gbps) ports on the back panel, while the X299 chipset manages four more USB 3.1 ports and six USB 2.0 between headers and the back panel. 

Networking duties are all Intel - the wired ports are handled by the Intel I219-V and I211AT Gigabit LAN controllers and the wireless card is an AC 8265. Audio comes via an upgraded Realtek ALC1220 solution.

Our manual overclocking results matched that of most other X299 boards using the new CPU. For automatic overclocking, this board, as did the M7 ACK, still implements overly-aggressive voltage profiles too early when using Game Boost. 

Being the flagship motherboard, it does come at a price premium. We can currently find the MSI X299 XPower Gaming AC at $440. This price point puts it up against the ASUS Prime X299-Deluxe we recently reviewed at $475,  the GIGABYTE X299 Designare EX at $450, And finally ASRock's flagship Fatal1ty X299 Professional Gaming i9 XE priced below it at $390

MSI X299 Strategy

MSI's X299 XPower Gaming AC holds the current flagship position of MSI's range, and makes its home in the Enthusiast Gaming segment along with the X299 Gaming M7 ACK. At present there are a total of three boards in the Performance Gaming hierarchy, with the Arsenal line that carries the Tomahawk boards. MSI has the standard Pro lineup for more cost-effective options that have slightly fewer features.

MSI's X299 Motherboard Lineup
Amazon Newegg
X299 XPower Gaming AC [this review] $450 $450
X299 Gaming M7 ACK Review 3/5 $366 $380
X299 Gaming Pro Carbon AC Review 9/21 $273^ $330
X299 Gaming Pro Carbon   $320 $320
X299M Gaming Pro Carbon AC Review 3/22 $277 $290
X299 Tomahawk AC   $273 $290
X299 Tomahawk Arctic Review 11/20 $280 $280
X299 Tomahawk   $256 $270
X299 SLI PLUS Review 11/29 $232 $220
X299 Raider   $215 $220
X299M-A Pro   - $237^

^ Third Party Sellers

Information on Intel's X299 and our other Reviews

With Intel's release of the Basin Falls platform, encompassing the new X299 chipset and LGA2066 socket, a new generation of CPUs called Skylake-X and Kaby Lake-X were also released. The Skylake-X CPUs range from the 7800X, a hex-core part, all the way up to an 18-core 7980XE multitasking behemoth. Between the bookend CPUs are five others increasing in core count, as in the table below. The latter HCC models are set to be launched over 2H of 2017.

Skylake-X Processors
  7800X 7820X 7900X   7920X 7940X 7960X 7980XE
Silicon LCC   HCC
Cores / Threads 6/12 8/16 10/20   12/24 14/28 16/32 18/36
Base Clock / GHz 3.5 3.6 3.3   2.9 3.1 2.8 2.6
Turbo Clock / GHz 4.0 4.3 4.3   4.3 4.3 4.3 4.2
Turbo Max Clock N/A 4.5 4.5   4.4 4.4 4.4 4.4
L3 1.375 MB/core   1.375 MB/core
PCIe Lanes 28 44   44
Memory Channels 4   4
Memory Freq DDR4 2400 2666   2666
TDP 140W   140W 165W
Price $389 $599 $999   $1199 $1399 $1699 $1999

Board partners have launched dozens of motherboards on this platform already, several of which we will have an opportunity to look over in the coming weeks and months. 

Other AnandTech X299 Motherboard Reviews:

To read specifically about the X299 chip/platform and the specifications therein, our deep dive into what it is can be found at this link.

To read specifically about the X299 chip/platform and the specifications therein, our deep dive into what it is can be found at this link.

X299 Motherboard Review Notice

If you’ve been following the minutiae of the saga of X299 motherboards, you might have heard some issues regarding power delivery, overclocking, and the ability to cool these processors down given the power consumption. In a nutshell, it comes down to this:

  • Skylake-X consumes a lot of power at peak (150W+),
  • The thermal interface inside the CPU doesn’t do much requiring a powerful CPU cooler,
  • Some motherboard vendors apply Multi-Core Turbo which raises the power consumption and voltage, exacerbating the issue
  • The VRMs have to deal with more power, and due to losses, raise in temperature
  • Some motherboards do not have sufficient VRM cooling without an active cooler
  • This causes the CPU to declock or hit thermal power states as to not degrade components
  • This causes a performance drop, and overclocked systems are affected even more than usual

There has been some excellent work done by Igor Wallossek over at Tom’s Hardware, with thermal probes, thermal cameras, and performance analysis. The bottom line is that motherboard vendors need to be careful when it comes to default settings (if MCT is enabled by default) and provide sufficient VRM cooling in all scenarios – either larger and heavier heatsinks or moving back to active cooling. 

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  • BPB - Wednesday, May 9, 2018 - link

    Sigh, I guess I can always dream about owning such an expensive board. But I can't imagine anybody who is budget conscious or not rich buying one. I wonder how MSI and the others sell enough boards like this to justify making them.
  • Achaios - Wednesday, May 9, 2018 - link

    Unfortunately, the era of me dreaming of motherboards and CPU's passed long ago with no signs of returning. Nowadays, the only thing I usually dream of is East Asian fleshpots and lots and lots of ambitious girls in, out, on top and below. Do I miss the time my only interest in the world was my Pentium 4, my NVIDIA GO GPU with 128 megs of RAM and World of Warcraft? Sometimes yes but not really.
  • WinterCharm - Wednesday, May 9, 2018 - link

    Hands down the funniest comment I’ve read on here in a long time :)
  • Ket_MANIAC - Wednesday, May 9, 2018 - link

    And another great X299 review. Expecting at least a dozen more such reviews and expecting no review for any AM4 boards or X470 boards at all because who buys cheap stuff. Come on guys, is it really that hard? People already blame you guys to being Intel shills and all and reviews such as these only add fuel to their talk. Not that the review is bad but what reason could you have for this megaload of X299 reviews?
  • rsandru - Wednesday, May 9, 2018 - link

    Agreed, X299 is going to be replaced soon anyway so even for potential Intel HEDT buyers all those motherboards are most likely non starters... And this one still sports the tiny VRM heat sink that was repeatedly pointed out as being insufficient.

    To round this perfectly marketed product there’s the ‘gaming’ in the name, as if anyone whose main interest is playing games would pick an X299 platform over a Z370.
  • Peter2k - Wednesday, May 9, 2018 - link

    You'd be surprised how many gamers where absolutely convinced they need quad channel and a bazillion pcie-x lanes for that sweet sweet quad GPU setup they gonna have one day so that they don't throttle when using many M2 SSD's

    Marketing must be doing a great job these days

    Surprisingly it's the sort of same amount of gamers that don't know that quad GPU setups are dead
    Quad channel doesn't do anything for gaming (or most use cases anyway)

    As long as there are LED's on it
  • Ket_MANIAC - Thursday, May 10, 2018 - link

    What I am baffled about is the lack of AM4 motherboard reviews from AnandTech. They are one of the few publications out here who do motherboard reviews right and just 6 reviews in over a year, out of which 3 are boards that no body ever buys when talking about AM4. Yes, they have covered a lot of Ryzen stuff lately. And motherboard reviews are generally not as important as CPU. But if that's the case, how do you justify "16" X299 reviews? And no X399? I might be coming of as an AMD fanboy, so hold your horses. I am an AMD fan. Not a fanboy. It doesn't take an Einstein to know which among the X299 and AM4 is more important and which among the X299 and X399 is more successful.
  • DanNeely - Thursday, May 10, 2018 - link

    Mobo Reviewer A is doing all of the x299 boards in a single giant batch.

    Mobo Reviewer B is doing all of the AM4 boards in a single giant batch.

    The selection of boards they get to review come down to what manufactures send as press samples. There're enough of those to keep all the reviewers busy full time so Anandtech rarely if ever buys retail boards to review.

    There currently isn't an active Mobo Reviewer C, so any x399 samples that've been sent in are waiting until A or B clears his current backlog; or one of the other contributors clears out the backlog of what they're currently working on and can step in on mobos again. (eg E. Fylladitakis did a batch of mobos last summer between his keyboard and PSU reviews.)
  • Ket_MANIAC - Thursday, May 10, 2018 - link

    Quite alright but doesn't 16 X299 reviews seem to you as pointless? I don't know if you are representing Anandtech but if you are, don't you think more AM4 stuff would bring more readership to your website? You guys have the power to choose which boards you review among the ones that manufacturers send you and I don't think it is possible that Asus has never sent the Crosshair VI Hero or the VII Hero to you(from the CPU review, I see they had), ASRock never sent the X370 Taichi to you. Wouldn't reviewing these boards make more sense right now considering the 2000 series just launched?
  • PeachNCream - Wednesday, May 9, 2018 - link

    It's another X299 MSI motherboard review, because we really need to hear more about MSI products since there are no other vendors out there that produce computer parts.

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