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post #3891 of 12377
LLC is a must for high stable overclocks its why I ditched my UD3 R1.0

My sabertooth R2.0 gets 5ghz on the same voltage as I could only get 4.75ghz stable on the UD3. Also runs cooler because the voltage isnt all over the place.

If you mange to get 5ghz stable on the UD3 I bet with a better board youd get 5.1ghz stable on the same voltage.
post #3892 of 12377
Quote:
Originally Posted by kzone75 View Post

Quote:
Originally Posted by Bitemarks and bloodstains View Post

My suicide shot
http://valid.canardpc.com/show_oc.php?id=2593201

What's the CPU VID on your chip, if I may ask?
1.3625v
post #3893 of 12377
Quote:
LLC is a must for high stable overclocks its why I ditched my UD3 R1.0

My sabertooth R2.0 gets 5ghz on the same voltage as I could only get 4.75ghz stable on the UD3. Also runs cooler because the voltage isnt all over the place.

If you mange to get 5ghz stable on the UD3 I bet with a better board youd get 5.1ghz stable on the same voltage.

voltage is kinda all over the place, but that is because i use Cool and Quiet. Well scratch that, i use Mr phenoms tweaker for custom cool and quiet.

I have been to 5.2ghz when it was 30 degrees outside, and i left the window open. I just set the voltage in bios to 1.6volts, then under load it would drop to around 1.54 or so. With cool and quiet my voltage was never 1.6 volts anyways, so it was safe. All this on the Ud3 rev 1.0.

I know a few other Ud3 guys who have accomplished quite high clocks, I personally don't think its the board, but the user and the setup. I do understand more people seem to get better overclocks on the Crosshair V. I might grab the Crosshair V Formula Z if i can find a good deal on one. Then sell my UD3.

So far though i've had nothing but success with the Ud3. I'm rocking 4.9ghz daily 24/7 on my 8120 with 1.45 volts. I can run 5ghz at 1.5 volts but my Poor Antec 920 doesn't like the extra heat, and i don't like the extra racket that comes from its loud annoying fans. Thus I decided to go to custom water loop. Will soon have a XSPC Rx 240+140mm dual radiator For a total of 520 of radiator madness for just the CPU. I will say i will be cooling the chipset and my 7950 as well when i get the funds for the blocks. Though i cannot decide if i want to upgrade to the Crosshair formula Z before i get the chipset blocks.
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post #3894 of 12377
Quote:
Originally Posted by ebduncan View Post

the UD3 has plenty enough VRM for the FX processor. It supports up to 400amps.

Don't know about UD3 but UD7/UD5 have Vishay Siliconix's SiC769CD DrMOS.
Each mosfet is capable to deliver 35 Amps max. This means 35 x 8 phase = 280 Amps for CPU core power.

http://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&ved=0CC8QFjAA&url=http%3A%2F%2Fwww.vishay.com%2Fdocs%2F64981%2Fsic769cd.pdf&ei=5HWyUK79GtDnrAe7mYCAAw&usg=AFQjCNHFNsdsDXg4UpLZr4tP5KKQhHJb8A&sig2=RKVrHg6uF5_1uRUmGKh4Pg
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post #3895 of 12377
Quote:
Don't know about UD3 but UD7/UD5 have Vishay Siliconix's SiC769CD DrMOS.
Each mosfet is capable to deliver 35 Amps max. This means 35 x 8 phase = 280 Amps for CPU core power.

http://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&ved=0CC8QFjAA&url=http%3A%2F%2Fwww.vish

i think you might want to check your math. The ud3 supports 400amps, i don't see why the ud5 or ud7 would support less amps. In regard to the Asus crosshair V it supports 2000amps (yes really)

I think you went wrong by giving it just one mosfet per phase, which is usually not the case. The asus has 3, the ud3 has 2.
Edited by ebduncan - 11/25/12 at 1:50pm
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post #3896 of 12377
Quote:
Originally Posted by ebduncan View Post

i think you might want to check your math. The ud3 supports 400amps, i don't see why the ud5 or ud7 would support less amps. In regard to the Asus crosshair V it supports 2000amps (yes really)
I think you went wrong by giving it just one mosfet per phase, which is usually not the case. The asus has 3, the ud3 has 2.

2 Kamps eh? Source plz?
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post #3897 of 12377
Quote:
2 Kamps eh? Source plz?

http://www.hardcoreware.net/gigabyte-990fxa-ud3-review/3/

notes 2k amps on the crosshair.

but here is their actual review of the crosshair for the mosfet information
http://www.hardcoreware.net/asus-crosshair-v-formula-review/3/
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post #3898 of 12377
Quote:
Originally Posted by ebduncan View Post

the UD3 has plenty enough VRM for the FX processor. It supports up to 400amps. Its not going to be enough if your under Ln2, and want to jack the voltage up higher, but for water/air its plenty. If your using LN2/phase change/ Chilled water the Crosshair V is the way to go.
It is unlikely the VRMS are holding his overclock back.

The VRM hits over 130 celsius for me under load with an 8150 at 1.5v. on air... A bit much I think
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post #3899 of 12377
Quote:
Originally Posted by ebduncan View Post

http://www.hardcoreware.net/gigabyte-990fxa-ud3-review/3/
notes 2k amps on the crosshair.
but here is their actual review of the crosshair for the mosfet information
http://www.hardcoreware.net/asus-crosshair-v-formula-review/3/
Quote:
Originally Posted by ebduncan View Post

i think you might want to check your math. The ud3 supports 400amps, i don't see why the ud5 or ud7 would support less amps. In regard to the Asus crosshair V it supports 2000amps (yes really)
I think you went wrong by giving it just one mosfet per phase, which is usually not the case. The asus has 3, the ud3 has 2.

Man I didn't know about CHVFormula and UD3. But after seeing your link UD3's each phase (which includes a low side MOSFET and a high side MOSFET with a Driver IC) can really deliver 50 Ampere per phase. Which obviously makes 50 Amps x 8 phase = 400 Amps total. smile.gif

But here UD5 don't have the same design. This time low side mosfet, high side mosfet and driver IC is integrated into one chip. The whole package is called Driver MOSFET or DrMOS.

UD5 has ten units (8+2) of "Vishay Siliconix SiC769CD" VRM. You can see here.
Source: http://www.hardwaresecrets.com/printpage/Gigabyte-990FXA-UD5-Motherboard/1311




Here is the technical specification of this VRM.


As you can clearly see each SiC769CD VRM delivers 35 Amperes current. Finally total 280 Ampere ( 35 Amps x 8 phase) is available for Main CPU core power.

One sec....What the heck blinksmiley.gif This means UD3 is much better in CPU overclocking. !? confusedsmiley.png
Edited by sumitlian - 11/27/12 at 1:54am
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post #3900 of 12377
Quote:
As you can clearly see each SiC769CD VRM delivers 35 Amperes current. Finally total 280 Ampere ( 35 Amps x 8 phase) is available for Main CPU core power.

One sec....What the heck This means UD3 is much better in CPU overclocking. !?

something is off there.

Perhaps the model number for the mosfet is not correct? if it handles 50 watts per mosfet then would be the same as the ud3. I dunno, I don't have a ud5 or ud7 to look at.
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