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overclocking dfi pro 875 b

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mckennaiii

Member
Joined
Jun 28, 2003
the dfi bios is a bit different than i'm use to with abit. could use some help on making the correct settings.
what do i set the memory freq. at to start with _____________?
system bandwidth ___________________?
cpu clock __________________?
what number do i start with to key in the dec # 200-400 __________?

my current bios specs are listed below.
dfi 875 pro b
3.0 e.s. cpu
asus v9280 s video card
mushkin pc3200 level II bh5 2x256
hitachi sata 80gb h.d.
nec dvd 2500a
antec p160 case
nec 1.44

genie bios settings:

cpu clock 200

cpu clock ratio 15

cpu clock now is 3.0

agp/pci/sata clock auto

auto detect pci clk enabled

spread spectrum enabled

cpu voltage 1.55

dimm voltage 2.7

agp voltage 1.5



advance chipset features:

dram timing by spd

cas latency time 2.5

active to precharge delay 6

dram ras to cas delay 2

dram ras precharge 2

memory freq auto

sys. bandwidth lps1

sys. bios cacheable enabled



pc health status:

curr. sys. temp. 35 / 85

curr. cpu temp. 45 / 113

current cpu fan speed 2445

thankx,
bill
 

LevaR

Registered
Joined
May 28, 2004
Location
Poland
Memory frequency is just a different name for fsb:ram ratio. At 400 it's 1:1, 320 is 5:4 and 266 is 3:2.
Set system bandwidth to disabled.
Disable system and video bios cacheable.
Set agp/pci/sata to 66/33/100.
Disable auto detect pci clock and spread spectrum.
Your bh5 may not go higher than 220 fsb with only 2.9 vdimm so i would try fsb 210 with 2-6-2-2 timings and slowly increase fsb to find max for your ram.
You can also try with 5:4 ratio and see how high your cpu will go.
Finally you could play with the cpu clock ratio if you have unlocked multiplier.
 
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mckennaiii

Member
Joined
Jun 28, 2003
do i set the memory freq., @ ddr 400 1:1 ?

what do i set the cpu clock at ?
min. 200
max. 400
key in dec #

thankx,
bill
 

LevaR

Registered
Joined
May 28, 2004
Location
Poland
Cpu clock is for setting fsb so like i said 210 for start and slowly increase keeping you ram at 1:1 (ddr400).
You should test stability with memtest 86+. Just download a bootable cd ( http://www.memtest.org/#downiso ) and run test 5 for couple of minutes if it's error free increase fsb and test again if it gives errors increase the vdimm voltage and test again.
 
OP
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mckennaiii

Member
Joined
Jun 28, 2003
thankx that answered my question.
*just to make sure i do need to disable the system and video bios cachable?
thankx,
bill
 
OP
M

mckennaiii

Member
Joined
Jun 28, 2003
your instructions were perfect and i really appreciate the time and effort you took to help me.
i did everything as you stated and started off at 210 and it booted just fine.
i'll inch up some once a day.
thankx again.
regards,
bill