The BIOS and software for the X99-A is near identical to that of the X99-Deluxe, which reviewed back at the launch of the X99 platform. Our analysis is provided here for completeness with a few minor changes for how the X99-A differs.


The ASUS BIOS for X99 is going to closely mimic that for Z97, given the close proximity of the launch of the two. The main difference will be catering for the X99 specific features, such as eight DIMMs and the dual AHCI controllers in the chipset. While I would assume that very few users are upgrading from Z97 to X99, those that coming from the 9-series or 8-series motherboards should feel at home. Users coming from the latest X79 builds will notice a slight change towards something more user friendly. First screen up is the EZ mode:

Due to the increased info placed in this first screen, the font size has been reduced slightly, especially when detailing all the DRAM and SATA slots ports that are connected. In this front screen we are told the name of the motherboard, the CPU used, the speed of the CPU, where the DRAM is populated and how much, only with the speed and options for XMP. The CPU and motherboard temperatures are here, with the CPU getting a graph in real time showing how the temperature changes. Voltages and fan speeds are here as well, with a point-to-point graph showing the fan profile of the CPU fan. On the right hand size is an EZ System Tuning icon for performance or energy saving modes as well as a Boot Priority list. On the top of the screen is an option for the EZ Tuning Wizard.

For the fan profiles, selecting QFan Control allows the user to adjust the three point fan gradient:

Each of the fan headers can be controlled by in either DC or PWM mode, with several presets at the bottom and a choice of fan headers on the right. This is the most interactive fan control system within a BIOS to date, however I would suggest a couple of add-ons: a button that sets all the fan profiles at once (otherwise you have to adjust each of them individually), and text showing the current fan speed of the fan selected along with the temperature associated with that fan. In future iterations, perhaps a button to simulate a CPU load (1 core/2 core/4 core) to manually test the fan response might also be considered.

The EZ Tuning Wizard at the top is the new auto tuning mechanism in the BIOS to apply overclocks. As with Z97, this system detects the current outlay, asks what cooling is being used and what the system is for, and then goes back into its internal database to suggest an overclock. This overclock can then be applied automatically:

So here the system is suggesting a 32% overclock, from 3.0 GHz to 4.1 GHz when I selected that I had not-sure cooling. The reason why the system asks about different types of intended use should come down to single core turbo modes – users interested more in day-to-day responsiveness will want a high single-core turbo, whereas gamers and media editors will want all the cores boosted to the maximum.

Alongside the EZ Mode, the ASUS BIOS offers its characteristic Advanced Mode:

Options here are a little more in-depth and clinical, although ASUS has taken on board suggestions and added both an information section at the bottom and a list of information on the right hand side telling the user what the current state is. Users jumping into X99 from very old systems might be interested in the My Favorites menu, which allows users to select certain options from the BIOS for a custom menu interface. With the Setup Tree Map we can select which options to have in My Favorites, which in my case ends up looking like this:

My Favorites is aimed more at overclockers than anything else, allowing these enthusiasts access to frequent settings while bypassing others that are present but might not make a difference in line with the overclocking skill of the individual.

ASUS still keeps the full-fat overclocking menu on hand, giving a full set of options for CPU, DRAM, DIGI+ Power, voltages and power management.

The Advanced Menu gives the usual array of CPU, PCH and Onboard Devices set of configuration menus. A few changes from previous platforms are worth mentioning, such as individual core selection for overclockers:

Because not all cores are created equal, the new topology allows users to select specific cores for frequency records.

The onboard devices configuration menu gives the option for adjusting the bandwidth between the controllers onboard that share data paths:

By default the enhanced battery charging of the ASMedia USB 3.0 ports is disabled, and the PCIe 2.0 x4 slot is set to Auto mode.

The Monitor tab gives all the temperature and fan speed data, along with options for the fan headers in a less-interactive but classic implementation:

Users can select different modes for each header (PWM or DC), different preset profiles (Standard, Silent, Turbo), adjust which temperature sensor is relevant or adjust a two point gradient manually. The QFan Tuning option provides insight into the workings of each fan by detecting the low-end dead points.

The rest of the BIOS is the standard array of booting options, fast boot options, BIOS flashing tools, OC profiles and SPD information. There is one last feature to mention, the GPU Post screen:

This shows each of the PCIe slots, what is installed and at what speed they are running.

There is one aspect where ASUS is lagging behind the other manufacturers, although GPU Post is part of the way there. ASRock and MSI now implement a ‘Board Explorer’ type function that shows a 2D representation of the motherboard and tells the user what is installed at each point. ASUS should think about this going forward, although it is worth noting that the X99-A uses 128 Mbit BIOS chips rather than the usual 64 Mbit ICs, suggesting that the BIOS is now getting bigger (and double-sized BIOS chips add cost).

ASUS X99-A Overview, Visual Inspection, Board Features ASUS X99-A Software


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  • Samus - Tuesday, December 23, 2014 - link

    Probably an awesome board for $200, but I agree with the conclusion: just not worth it for $250+ when $300-$350 gets you a way nicer board. We're already talking supercar-class with the X99 platform as it is so why penny pinch when building a $1000+ PC. If you're building a Ferrari, build a Ferrari. Reply
  • ziphnor - Tuesday, December 23, 2014 - link

    Just did a built with an X99-A myself. With the prices available to me the X99 Deluxe is ~60% more expensive than the X99-A and seems to only offer a lot of crap that i dont need in comparison? How does it make my desktop PC more "Ferrari" by having WiFi, extra ethernet ports or more storage options, especially when i have no need of them? Reply
  • SuperVeloce - Tuesday, December 23, 2014 - link

    I agree. This is a spot on board for something like 5820k and single gpu setup. Reply
  • dcoca - Tuesday, December 23, 2014 - link

    I disagree, it supports X16 X16 for sli and plus X8 for tri and solution: I have this board and with the Asus app it overclocked my cpu to 4.6 all cores stable.. and it had x4 for m.2 so that's great in the future... I picked it overs cause of the Asus name and features that I needed.. Reply
  • dcoca - Tuesday, December 23, 2014 - link

    That should of read AMD solution... Reply
  • ziphnor - Friday, December 26, 2014 - link

    Out of curiosity, could you provide some details on that 4.6 OC? Is it "stable" or Prime95 stable, and what voltage did you need? I am on air, and have only managed 4.3@1.175V with my 5820k, and only in combination with setting a Turbo Boost TDP limit (otherwise i cannot run Prime95 succesfully) Reply
  • dcoca - Friday, January 9, 2015 - link

    Sup sir, well the application did it's thing and increase the vcore to 1.3 and I ran prime95.. with that said I took it back to 4.4 cause the antech 650 wasn't cooling it to the level I want... I run simulations for a hobby of the universe so can't have the pc crash on me cause of heat Reply
  • R3MF - Tuesday, December 23, 2014 - link

    agreed, what i did with the MSI X99 SLI-plus Reply
  • paesan - Wednesday, December 24, 2014 - link

    I did a build with this board for my brother and was able to overclock the 5820K to 4700 using the 5 way optimization. I used the Corsair H100i for cooling the cpu. This board is the best price point for those that do not need wifi, extra lan port and other extra features that are in the deluxe version. I agree with you that the deluxe version adds more features that a lot of people have no need for. I have a z87-pro board and never use the wifi. Reply
  • R3fug388 - Tuesday, December 23, 2014 - link

    The bottom of the first page, where you mention the 4 USB 2.0 on the back panel. Is that a typo? Is it supposed to be USB 3.0? Reply

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