Tuesday, September 1, 2015

Gigabyte 78LMT-USB3 Review

Grey and black a color scheme almost as good as black and black. I like it. The board has two 4 pin fan headers one for the CPU and one for a chassis fan. There are six SATA 2.0 ports on the board and 1 IDE connector. Also one internal USB 3.0 port and two USB 2.0 ports.




















four USB2.0, one VGA, one DVI, one HDMI, and two USB3.0 along with basic audio.






















VRM
CPU VCore
- Richtek RT8868 4+1 phase controller
- 4 true phases
- 2 Renesas K0393 Low side MOSFETs rated for 40A at 25C 
- 2 Renesas K03B7 High side MOSFETs rated for 30A at 25C 
- 680nH inductors
- 38.4g Heatsink
- 270KHz to 330Khz 
- 5K rated capacitors however they are very low capacity
- LLC Auto/Regular/Extreme 
- OCP(around 90A) OVP  
CPU NB
- 1 true phase
- 1 Renesas K03B7 High side MOSFETs rated for 30A at 25C 
- 1 Renesas K03B7 Low side MOSFETs rated for 30A at 25C
- 270KHz to 330Khz
- OCP OVP 
RAM
- 1 true phases
- Same MOSFETs as CPU core - No heatsink
- Unknown minimum to unknown maximum KHz
Verdict: 5/10
40A at 25C is very very little. So to be safe it's best to assume a de-rating of 50% at 100C meaning that there is a total of 160A available on the low side. Luckily the RT8868 features OCP so this motherboard shuts down before it catches fire if you push it too far. When under load the capacitors and inductors get into the 110C area without a fan over them. The MOSFETs them selves are kept in the 75-85C area by the heatsink. I'd recommend putting some heatsinks on the inductors and capacitors and a fan over the entire VRM in order to extend life span. Even a basic 50x50mm fan at 2000RPM would help significantly.

BIOS
Voltages:
- Max VCC: 1.4375V
- VCC LLC Extreme(I+75mv/L+150mv) Regular(I+0/L-30mv) 
- Max VNB: 1.475V
- Max VDDR: 1.9V
CPU:
- 35x maximum CPU multi 
- 20x maximum CPUNB multi
- Full active core cuntrol with support 1 core per CU mode
DRAM:
- No XMP Support
- Missing tertiary sub timings
- No support for asymmetrical timings
- All timings are either automatic or manual 
- Up to 2400mhz support 
EXTRAS
- No Extras 
Verdict: 4/10
This BIOS has many flaws. First of all the CPU voltage setting shows incorrect values until you get the OCP to trip. So when you first boot the board and want to overclock the CPU you will see the option to run 1.7125 Vcore however if you actually set that you only get 1.43V when idling and 1.4V while running regular LLC. Extreme LLC is what it says on the box. It's EXTREME LLC. Giving a ridiculous 75mv Vboost at idle and an even more insane 150mv Vboost under load. I suggest you just don't use Extreme LLC because setting up to not trip the OCP the moment you go under load is really really hard and the low idle voltage will mean stability will always be very very iffy when using it. There are also no OC profiles. The postives of the BIOS are the 1 core per CU mode and the relatively easy navigation and the good responsiveness that some of the overly graphical BIOSs these days lack.


That's 214W on the CPU power line. I tried to push more than that but the terrible LLC options and low maximum voltage setting meant that my attempts always pushed well over 240W(was aiming for 220-230W) to the CPU and tripped the OCP. So if you were really brave and patient you cold maybe get a 9000 series FX to run on this board. But you most likely won't and I don't think it's worth the effort.

Testing Results:
The following hardware ran stable, using Intel Burn Test (IBT) for stress testing.
- G,skill ECO 2x2GB 1333 7-7-7-24 1.35V/max clock: 1866mhz 9-10-9-27-2T 1.65V
- Max CPU clock 8 core: 4444mhz at 1.4375V
- Max FSB clock: 217mhz
Verdict: 5/10
My FX 8320E is not a very good chip. And this boards weak VRM will not give you more 
The OCP on the VRM does it's job however it makes rebooting a pain because it doesn't shut the system down it just kills the CPU VRM which leaves the rest of the system still running. When that happens you need to cut AC power from the system because holding the power button doesn't seem to do anything.

Conclusion: 14/30 Points, 0.233pts/$
Between this board and the 970M Pro3 I think the key to choosing the right one is knowing what you want to do. This board is easy to use and very safe. The Pro3 on the other hand offers much more CPU voltage freedom and can definitely push higher clocks but the only safe guard it has is the temperature related throttling. If you just want a basic AM3+ MATX board to get 4.4-4.6Ghz depend on your CPU this board is enough. The VRM has enough cooling to not catch fire and the OCP will stop you before you kill the MOSFETs. You also have an integrated GPU that can save you if you dedicated doesn't want to work. This board also offers better RAM overclocking however that's not really worth talking about with a board that is limited to 1.4375 Vcore. Either way it's a good board and if you want to run an AMD 8 core in an MATX system but don't plan to overclock very much this board has you covered.

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As always thank you to CoolerMaster for powering the blog.

5 comments:

  1. So do you think its safe to OC an 8320 to 4.0ghz with a decent cpu cooler?

    Could it get anymore than 4.0?

    ReplyDelete
    Replies
    1. 4-4.4 should be doable if you have a good CPU.

      Delete
    2. Thanks! Will give it a go at somepoint and report back!

      Delete
  2. Man I did not realize that about the LLC and "extreme" overcompensation. This board is very touchy but just about the only mATX like it with four DIMM slots so I'm okay with the glitches. I noticed that 1.7v showing on first boot, I nearly soiled myself lol. Still rock solid for what it is.

    ReplyDelete