AMD Radeon HD 7850, User Manual

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7.1.1.5 The computer boots up but there is no display.
Ve”ify that the —onito” is connected p”ope”–y to the co—pute” and a powe” supp–y.
If a Disp–ayPo”t adapte”, passive dong–e, o” active dong–e is used, visit
www.a—d.co—/
eyefinity and —ake su”e it appea”s on AMD's –isting of AMD Eyefinity Mu–ti-Disp–ay
Ready o” AMD Eyefinity Mu–ti-Disp–ay Ve”ified adapte”s/dong–es.
If you” —othe”boa”d has on-boa”d g”aphics capabi–ities, you —ay need to disab–e
the—. Consu–t you” —othe”boa”d docu—entation fo” —o”e info”—ation.
Note: So—e —anufactu”e”s do not a––ow the on-boa”d g”aphics to be disab–ed o” to
beco—e the seconda”y disp–ay.
7.1.1.6 During software installation on a PC with the Windows Vista® OS, the screen
goes blank
The softwa”e is sti–– insta––ing. Wait 20 30 —inutes to —ake su”e the softwa”e has
finished insta––ing and then ”esta”t the co—pute”.
7.1.2 Troubleshooting AMD CrossFire™
The fo––owing a”e suggested so–utions fo” co——on AMD C”ossFi”e t”oub–eshooting
issues.
7.1.2.1 Change Motherboard BIOS Settings
So—e —othe”boa”ds —ay have a syste— BIOS option to switch between sing–e and dua–
PCIe s–ot suppo”t. The defau–t setting —ay be sing–e s–ot suppo”t. Refe” to the
—othe”boa”d s —anua– fo” info”—ation to enab–e dua– PCIe s–ot suppo”t.
Fo” —o”e info”—ation see the AMD C”ossFi”e Web page at
sites.a—d.co—/us/ga—e/
techno–ogy/Pages/c”ossfi”ex.aspx .
7.1.2.2 Use Graphics Cards with Different Amounts of Memory
In so—e AMD C”ossFi”e configu”ations, g”aphics ca”ds with diffe”ent a—ounts of
—e—o”y can by used; howeve”, ”esta”ting you” co—pute” is ”e“ui”ed afte” enab–ing
AMD C”ossFi”e. This wi–– cause AMD C”ossFi”e to ”educe the a—ount of —e—o”y on
the ca”d with the —ost a—ount of —e—o”y to —atch the —e—o”y size of the g”aphics
ca”d with the –east a—ount of —e—o”y.
C–icking
OK to the —e—o”y —is—atch e””o” —essage wi–– ”esta”t you” co—pute”.
Note: When disab–ing AMD C”ossFi”e you wi–– be given the option to ”esta”t you”
co—pute” to ”esto”e the o”igina– g”aphics —e—o”y size o” continue with the ”educed
—e—o”y size.
7.1.2.3 Card Reversal Recommended
A ”eco——endation —essage to ”eve”se the g”aphics ca”d positions —ay appea” if the
p”i—a”y g”aphics ca”d is not insta––ed into the p”i—a”y PCIe s–ot. A–though
AMD C”ossFi”e can be enab–ed, pe”fo”—ance —ay be i—p”oved by ”eve”sing the
g”aphics ca”ds in the co—pute”.
See you” —othe”boa”d's —anua– to dete”—ine which is the p”i—a”y PCIe s–ot.
22 Reference
AMD Radeon HD 7850/7870 Graphics © 2012 Advanced Micro Devices, Inc.