LEGACY PCI ROM setting: does it impact graphics card speed?

Yosharian

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May 16, 2011
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Hello and thanks for taking the time to read my thread.

I recently bought an NVIDIA 770 (http://www.asus.com/Graphics_Cards/GTX770DC2OC2GD5/ that one more or less) and had a problem with my computer when I installed it: the computer would not boot properly and refused to go past the 'post' stage.

With the help of some fellow gamers I fixed this problem by changing my GIGABYTE motherboard's PCI ROM setting to 'Legacy'. This problem was apparently caused by my mobo's bios being outdated (not 100% sure on this though).

So the problem is fixed, but now my issue is that that I'm not very tech-savvy and updating my motherboard's bios is not something I would particularly relish.

So my question is: does having the mobo in Legacy PCI ROM mode slow the graphics card down? Does it impact in any way on the card's performance or the system's performance? Is there actually a solid reason to get the mobo updated, or should I just stick with it and be happy that it works?

My performance in Skyrim currently is not quite where I want it to be (I use a LOT of mods!) so if I could get extra performance I would definitely be interested.

Thanks for reading.

PS: my motherboard is a Gigabyte Z97-something or other.

PPS: this is what Gigabyte themselves are suggesting http://www.gigabyte.com/webpage/20/HowToReflashBIOS.html from the looks of that, @Bios is the easiest way to update the Bios. I'd be blindly following instructions, I have no idea what I'm doing.

PPPS: just ran 3Dmark11, got the following:

3DMark Score 9584 with NVIDIA GeForce GTX 770(1x) and Intel Core i5-3550 Processor
Graphics Score 10949
Physics Score 6922
Combined Score 7060
 
Solution
No it doens't. It only affects the time for the motherboard to run checks before your window logo comes on. It doesn't mater much if you set as Legacy or UEFI. If you want Ultra fast boot feature in Window 8, you need a GOP BIOS for your gpu to allow disabling CSM.
Your Motherboard should have included a Driver CD. Somewhere on that CD should be a program that automatically searches for, downloads and installs the latest BIOS for you Motherboard. I believe it's called @BIOS.

Here's a guide on how to use it safely and correctly: http://www.gigabyte.com/MicroSite/121/tech_a_bios.htm

You'll note it backs up the BIOS before updating, to reduce risk. If you have a Gigabyte motherboard with a Dual BIOS Chip you're at even lower risk since if your BIOS becomes corrupted your motherboard has a backup stored on a separate chip. Gigabyte have been very good at including this feature on many of their boards.
 
I don't really trust any software in Windows that will "help" me update the BIOS. I prefer going directly to the BIOS and update from there just in case the utility mess it up.
You really need to know what motherboard you have.
Download CPU-Z and check the Motherboard tab.
Or alternative find your motherboard box or the model name directly on the motherboard.
 
No it doens't. It only affects the time for the motherboard to run checks before your window logo comes on. It doesn't mater much if you set as Legacy or UEFI. If you want Ultra fast boot feature in Window 8, you need a GOP BIOS for your gpu to allow disabling CSM.
 
Solution

Yosharian

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May 16, 2011
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18,510


Well that is excellent news, thank you very much!