Four Multi-GPU Z77 Boards from $280-$350 - PLX PEX 8747 featuring Gigabyte, ASRock, ECS and EVGA
by Ian Cutress on August 22, 2012 9:15 AM ESTSystem Benchmarks
USB Speed
For this benchmark, we run CrystalDiskMark to determine the ideal sequential read and write speeds for the USB port using our 240 GB OCZ Vertex3 SSD with a SATA 6 Gbps to USB 3.0 converter. Then we transfer a set size of files from the SSD to the USB drive using DiskBench, which monitors the time taken to transfer. The files transferred are a 1.52 GB set of 2867 files across 320 folders – 95% of these files are small typical website files, and the rest (90% of the size) are the videos used in the Sorenson Squeeze test.
The obvious outlier in what should be a relatively simple USB 2.0 test is the ECS Z77H2-AX. For some unknown reason, it suffers a limited USB 2.0 speed at a round 25 MBps either read or write. To a certain extent, the EVGA also has some problems in USB 2.0 write.
The USB 2.0 problems are not present at all in USB 3.0 testing, with each of the boards performing similarly.
SATA Testing
We also use CrystalDiskMark for SATA port testing on a C300 drive. The sequential test (incompressible data) is run at the 5 x 1000 MB level. This test probes the efficiency of the data delivery system between the chipset and the drive, or in the case of additional SATA ports provided by a third party controller, the efficiency between the controller, the chipset and the drive.
The EVGA Z77 FTW motherboard has issues in SATA write tests, similar to the MSI previously tested.
DPC Latency
Deferred Procedure Call latency is a way in which Windows handles interrupt servicing. In order to wait for a processor to acknowledge the request, the system will queue all interrupt requests by priority. Critical interrupts will be handled as soon as possible, whereas lesser priority requests, such as audio, will be further down the line. So if the audio device requires data, it will have to wait until the request is processed before the buffer is filled. If the device drivers of higher priority components in a system are poorly implemented, this can cause delays in request scheduling and process time, resulting in an empty audio buffer – this leads to characteristic audible pauses, pops and clicks. Having a bigger buffer and correctly implemented system drivers obviously helps in this regard. The DPC latency checker measures how much time is processing DPCs from driver invocation – the lower the value will result in better audio transfer at smaller buffer sizes. Results are measured in microseconds and taken as the peak latency while cycling through a series of short HD videos - under 500 microseconds usually gets the green light, but the lower the better.
A trend worth noting is that all PLX PEX 8747 motherboards have some additional DPC latency compared to their brethren. Any score below 500 microseconds is good, but under 200 microseconds is better. The EVGA and the ECS fall outside this region with the two worst DPC scores on Z77. The best of the boards tested in this roundup comes with the ASRock Z77 Extreme9.
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ultimatex - Wednesday, August 22, 2012 - link
I got this MOBO from Newegg the first day they had it available , I couldn't believe the price since it offered 8x8x8x8x , Picked it up the first day and havent looked back. Doesnt look as cool as the Asrock extreme9 but it still looks good. Awesome Job Gygabyte , Anandtech should have given them a Gold not bronze though since the fan issue is a minor issue.Arbie - Wednesday, August 22, 2012 - link
For gaming, at least, how many people are really going to build a 2xGPU system? Let alone 3x or 4x. The are so few PC games that can use anything more than one strong card AND are worth playing for more than 10 minutes. I actually don't know of any such games, but tastes differ. And some folks will have multi-monitor setups, and possibly need two cards. But overall I'd think the target audience for these mobos is extremely small.Maybe for scientific computing?
Belard - Wednesday, August 22, 2012 - link
Yep.... considering that most AAA PC games are just ports from consoles... having 3-4 GPUs is pointless. The returns get worse after the first 2 cards.Only those with 2~6 monitors can benefit with 2-3 cards.
Also, even $80 Gigabyte boards will do 8x x 8x SLI/CF just fine.
But hey, someone wants to spend $300 on a board... more power to them.
cmdrdredd - Wednesday, August 22, 2012 - link
"Only those with 2~6 monitors can benefit with 2-3 cards."Oh really? 2560x1440 on a single card is garbage in my view. I am not happy with 50fps average.
rarson - Wednesday, August 22, 2012 - link
If you're going multi-GPU on a single monitor, you're wasting money.Sabresiberian - Wednesday, August 22, 2012 - link
Because everyone should build to your standards, O god of all things computer.Do some reading; get a clue.
Steveymoo - Thursday, August 23, 2012 - link
Incorrect.If you have a 120hz monitor, 2 GPUs make a tonne of difference. Before you come back with a "no one can see 120hz" jibe. That is also incorrect.... My eyes have orgasms every once in a while when you get those ultra detail 100+ fps moments in battlefield, that look great!
von Krupp - Friday, August 24, 2012 - link
No. Metro 2033 is not happy at 2560x1440 with just a single HD 7970, and neither are Battlefield 3 or Crysis. The Total War series also crawls at maximum settings.I bought the U2711 specifically to take advantage of two cards (and for accurate colours, mind you). I have a distaste for multi-monitor gaming and will continue to have such as long as they keep making bezels on monitors.
So please, don't go claiming that multi-card is useless on a single monitor because that just isn't true.
swing848 - Monday, December 8, 2014 - link
At this date, December 2014, with maximum eye candy turned on, there are games that drop a refrence AMD R9 290 below 60 fps on a single monitor at 1920x1080 [using an Intel i5-3570K at 4GHz to 4.2GHz]Sabresiberian - Wednesday, August 22, 2012 - link
This is not 1998, there are many games built for the PC only, and even previously console-oriented publishers aren't just making ports for the PC, they are developing their games to take advantage of the goodness only PCs can bring to the table. Despite what console fanboys continue to spew, PC gaming is on the rise, and console gaming is on the relative decline.