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 ESTMany thanks to...
We must thank the following companies for kindly donating hardware for our test bed:
OCZ for donating the Power Supply and USB testing SSD
Micron for donating our SATA testing SSD
G.Skill for donating our memory kits
ASUS for donating AMD GPUs and some IO Testing kit
ECS for donating NVIDIA GPUs
Test Setup
| Processor |
Intel Core i7-3770K ES 4 Cores, 8 Threads, 3.5 GHz (3.9 GHz Turbo) |
| Motherboards |
ASRock Z77 Extreme4 ASRock Z77 Extreme6 ASRock Z77 Extreme9 ASRock Fatal1ty Z77 Professional ASUS P8Z77-V Pro ASUS P8Z77-V Deluxe ASUS P8Z77-V Premium Biostar TZ77XE4 ECS Z77H2-AX EVGA Z77 FTW Gigabyte GA-Z77X-UD3H Gigabyte GA-Z77X-UD5H Gigabyte GA-Z77MX-D3H Gigabyte G1.Sniper 3 MSI Z77A-GD65 |
| Memory | G.Skill F3-19200CL9Q-16GBZMD |
| Power Supply | OCZ 1250W Gold ZX Series |
| Cooling | Intel All-in-One Liquid Cooler |
| Hard Drive | Micron RealSSD C300 256GB |
| Optical Drive | LG GH22NS50 |
| Case | Open Test Bed - CoolerMaster Lab V1.0 |
| Operating System | Windows 7 64-bit |
| SATA Testing | Micron RealSSD C300 256GB |
| Thunderbolt Testing | LaCie Little Big 240GB |
| USB 2/3 Testing | OCZ Vertex 3 240GB with SATA->USB Adaptor |
Power Consumption
Power consumption was tested on the system as a whole with a wall meter connected to the OCZ 1250W power supply, while in a dual 7970 GPU configuration. This power supply is Gold rated, and as I am in the UK on a 230-240 V supply, leads to ~75% efficiency > 50W, and 90%+ efficiency at 250W, which is suitable for both idle and multi-GPU loading. This method of power reading allows us to compare the power management of the UEFI and the board to supply components with power under load, and includes typical PSU losses due to efficiency. These are the real world values that consumers may expect from a typical system (minus the monitor) using this motherboard.
As a general rule, we see that the PLX 8747 motherboards consumer more power in most scenarios. The only exception to this is the EVGA Z77 FTW under Metro2033, which comes in at 480 W compared to the ASRock Z77 Extreme9 at 524 W.
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Namesblank - Tuesday, July 26, 2022 - link
10 years later, people be looking for how to build system with 20+ GPUs lmaomayankleoboy1 - Wednesday, August 22, 2012 - link
Where are the GPGPU benchmarks? AFAIK, those are affected by the PCIE 3.0 bandwidth, as shown in the HD7970 review.Games are more or less happy with a PCIE2.0 x8 .
MrSpadge - Thursday, August 23, 2012 - link
A few GP-GPU apps are affected, most aren't. Even PCIe 3 is slow as hell from the perspective of the GPU, so you try to avoid external communication as much as possible.TimoKyyro - Wednesday, August 29, 2012 - link
I was hoping to see some GPU rendering too. I'm using CUDA on Blender and I really need more GPU power. It would be nice to know if there is a difference between 4x 680 or 2x 690 on different PCIe setups.extide - Wednesday, August 22, 2012 - link
Thanks for providing the diagrams of lane routing. I wish ALL manufacturers would supply a diagram with their boards so you know how to set it up when you are building a system. Sadly, these diagrams are the exception, not the rule. :(processinfo - Wednesday, August 22, 2012 - link
For me only EVGA seems worth consideration (I don’t like a fan on chipset though).I have few requirements that others do not meet.
I want PS/2 keyboard port (don’t care about mouse). I don’t see it as legacy. It is still superior to USB for keyboard. Works on interrupts instead of pulling, allows as many keys pressed without ghosting as you wish (know it probably does not matter in real life but I like that anyway).
Display port output is mandatory for me these days. While it is true that this kind of mobo will run dedicated graphics card (or more than one for that matter) I like to have output here for possibility to use it with CPU graphics if my graphic cards breaks and needs replacement (I had that happen and waited almost two weeks for new one). HDMI is no go because does not support high enough resolution.
Gigabyte is out for me because audio chip. Maybe it is better but it does not do 7.1 and I will lose two channels in my Tiamat 7.1 headset.
rwpritchett - Wednesday, August 22, 2012 - link
You should check out some of the newer USB keyboards. I don't know how they do it, but some of them can now do full NKRO without PS/2. My Nighthawk X9 can do full NKRO over USB.processinfo - Thursday, August 23, 2012 - link
Interesting but this is not possible with standard USB keyboard protocol. If it does that it has to use some tricks and most likely custom keyboard driver.Also I have Thermaltake Meka G1 that I like and I purchased because I got tired replacing membrane keyboards so I rather buy motherboard with PS/2 then new keyboard.
My point is that at this price point and clearly meant for gamers (who else is using more than one graphic card in non-workstation pc) they should think about such details especially when they go overboard with other ports, e.g., who needs all 4 kinds of display output on gaming mobo, or 10 USB ports on back plate alone (if you need plenty you can have them on bracket connected to header).
MacGyverSG1 - Wednesday, August 22, 2012 - link
I loved the review. The G1.Sniper 3 was on my short list for a while. Could get back on, though.I'm waiting for the ASUS Maximus V Extreme to get tested next.
I only need a motherboard to complete my new build. I plan on running this new rig for 6+ years so I want a board that can keep up with the times.
just4U - Thursday, August 23, 2012 - link
I am staying away from the Rampage/Maximus lines from Asus this time out as Gigabyte has pretty much brought better value accross the board on their gamer boards. I don't expect Asus to catch up till the next chipset..