Official BIOS for UD3R,
Yes, after confrimed the BIOS with nvidia and Gigabyte,
GA-EX58-UD3R offically supports SLI technology.
and you just need to upgrade BIOS from website.
link is here,
http://www.gigabyte.com.tw/Support/Motherboard/BIOS_Model.aspx?ProductID=2989#anchor_os
BIOS: F5 2009/03/30
1. Support nVidia SLI
also, after F5, all BIOS including Beta BIOS all supports SLI.
first i download the official BIOS on GIGABYTE website, F5
here is the link, GIGABYTE - Support&Download - Motherboard - BIOS - GA-EX58-UD3R (rev. 1.0)
Test enviroment.
CPU, Intel core i7 975 sample @ 4.4GHz
CPU HSF, Thermalright utlra 120
M/B, GIGABYTE GA-EX58-UD3R , F5
Mermory, Kingston KHX16000D3T 3CH , 2GHz 1.65v
VGA, GIGABYTE GV-N28-1GH-B *2
PSU, Silverstone 1200w
NVdriver:Physx off
OS,Vista 32bit
Hardware picture

Turn on SLI

200Bclk*20, 4.4GHz, 1.45v for CPU, QPI-VTT 1.41v, DDR3-2GHz 1.66v
GTX 280 oc to 700GPU/1300GDDR3

if can't see the pictures, check this link
http://forums.vr-zone.com/hardware-arena/412770-ga-ex58-ud3r-offically-supports-sli.html#post6580574
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