Beware of Z77X UD5H

[bulldog147]

For guys who are thinking of buying Gigabyte Z77X UD5H - don't buy it because the memory ram are issues with this bios board.

I'm trying to oc my ram which has a default voltage of 1.35v but everytime I turn off the computer and turn it on the voltage gets reset to 1.50v. In the settings it is still set to 1.35v but it shows as 1.50v. Anybody else have this problem? I googled and did not see this result anywhere and it was F7 Bios as the same as stock bios come with this board F4. Gigabyte need to fix this memory to stop reset when turn off computer. If the memory ram is reset to 1.50v and with prime95 stress test all workers is stopped straight away. I had to clear CMOS, and do the same settings, and put memorey at 1.35v and reboot and this time the memory is stay at 1.35v and ran prime95 stress and it all went ok with no workers failed.

I had contact gigabyte about this issues but no reply yet. I might be thinking to exchange this board because I don't like kept reset itself everytime pc shutdown.

 

[opstrat]

mayby its a faulty board u have?

 

[covenantuk]

So, you're the only person that seems to have a problem with the memory voltage resetting, but somehow every single motherboard of this type has a problem?

 

[Dandle]

My UD5H is ok with samsung sgreen ram and doesnt reset the voltage on reboot.

 

[bulldog147]

I am not the only person, other person had the problem too on gigabyte site: http://forum.giga-byte.co.uk/index.php?topic=9056.0

 

[covenantuk]

There's lots of people using this motherboard and RAM here on these forums without this issue.

Does that not show you that you might either have a faulty motherboard or ram and should RMA one of them? Try later BIOSes?

 

[Frozen_Texas]

have you tried with F8c, F8d and F8 bioses?
http://forums.tweaktown.com/gigabyte/28441-gigabyte-latest-beta-bios-11.html#post274647

what is your RAM? try to change it and see what happens

 

[bulldog147]

samsung green ram here: http://www.overclockers.co.uk/showproduct.php?prodid=MY-017-SA

set at 2133MHz @ 10-10-10-28-1T @ 1.45v

 

[Alex h]

mines fine no reset problems

 

[bulldog147]

Deffo faulty board then !

 

[GIGA-Man]

I will ask our FAE team to check your question at our support system (GGTS) in the first priority

 

[4motions]

On top of the other problems I'm having with this board, I've also been suffering from this.

I'd put it down to a faulty board. Ran out of suggestions to fix it so am in the middle of RMA.

 

[bulldog147]

Glad to know that I am not the only person who had suffering from this. I must unlucky then. I had sent off GGTS gigabyte to report this)

Got quick reply from gigabyte:

Hello

If your RAM is Samsung Green MV-3V4G3D/US 8GB (2x4GB) DDR3 1600MHz
then please be informed that Samsung does not specify any "default" operating voltage at the frequency of 2133 MHz.
The voltage of 1.35V is designed for the speed up to 1600MHz, please kindly check at:
http://www.samsung.com/us/system/consumer/product/mv/3v/4g/mv3v4g3dus/DD3.pdf

Where do you check the RAM voltage: in bios or through some software under Windows? As the difference: 1.5V ~ 1.45V is only 3%, so why it causes problem to you? Is the system not stable?

Anyway you can try as follows:
1. Set RAM speed to 1600, then check what is voltage of RAM after setting it to the default value
2. Use different memory vendor
2. Update to the newer bios F8c:
http://download.gigabyte.eu/FileList/BIOS/mb_bios_ga-z77x-ud5h_f8c.exe

Best Regards
GIGABYTE Support

I had now set my ram at 1600MHz at 1.35v and see what happen

 

[bulldog147]

Saw gigabyte site and someone metion "Have you synchronised the two BIOS chips as recommended ?"

How do I gonna do this ? Any idea ?

 

[Frozen_Texas]

he meant that both bios chips better have the same bios version. there is BIOS switch (SW4) on this mobo, so after you upgrade the main bios then change to the backup and upgrade the backup one.
but i doubt if it influence this...

 

[bulldog147]

he meant that both bios chips better have the same bios version. there is BIOS switch (SW4) on this mobo, so after you upgrade the main bios then change to the backup and upgrade the backup one.
but i doubt if it influence this...

I don't know how to do it, I want to match both bios - gigabyte manual never explain how to do it by step by step.

 

[Frozen_Texas]

the best way to upgrade the bios is to use Q-Flash which is implemented in their bios. but first you have to prepare the file with the bios on the usb stick

p.s. they really answered you quickly, and it makes sense what they wrote...

 

[covenantuk]

I don't know how to do it, I want to match both bios - gigabyte manual never explain how to do it by step by step.

You can copy one to the other, but probably simpler to just change the switch to the BIOS you want to flash and flash it using the usual procedure.

Erm... were you trying to run the Samsung at 2133 on 1.35v?

 

[bulldog147]

No, I try Samsung at 2133MHz @ 10-10-10-28-1T @ 1.45v but I have now revert back to stock default 1600MHz @ 11-11-11-28-1T @ 1.35v and see what happen when I shutdown pc overnight and see if next day does reset memory to 1.50v itself. Wait and see till tomorrow.

It good to know that Gigabyte had reply to me instant. Great support.

 

[covenantuk]

2133 from Samsung at those timings and voltage could well pass benchmark stress testing but fail a cold boot. Some will make that speed and some won't - it's on the edge. If it's hot stable but not cold and the bootup fails the motherboard returns it to default voltage so that you can boot into BIOS and amend it.
Mine did exactly the same at that speed/voltage until I tuned the tertiary timings.

What you're seeing could be totally what to expect from overclocking RAM on this board. If it's stable at stock speed on 1.35v then this is probably your issue.