Summer 2008 XS Cheapazchips 3D Challenge

[Johnny Bravo]

for the capacitors - its pretty straight forward. See that strip of (-) signs down the sign. When you use an electrolytic capacitor that means that leg has to be the lower potential, so in this instance that refers to ground.

As for testing ground - easiest way is to use the blanking plate as it should be grounded. The problem is that sometimes (its rare but does happen) not all the grounds are "joined up" when the card isn't connected in the motherboard as the PSU will provide a common ground. On your multimeter there usually is a continuity tester which makes your multimeter buzz/beep when the probes short.Use this to check the grounds

The inductor/choke will always be a good starting point for finding a voltage, but you have to be careful which leg you measure from - get more info here From that you can usually see where the points all join up.

[dinos22]

lol

went all gung ho and knocked it all up

i use blutac to secure the stuff the PCB
looks messy but it works for me hehe

[Johnny Bravo]

Dinos I'd recommend using the ground at the IC for the vmod but apart from that you should be good to go

[dinos22]

all works now
will have to slap a 50K back i think hehehe

[dinos22]

Dinos I'd recommend using the ground at the IC for the vmod but apart from that you should be good to go

you mean near RAM chips

i will have an LN2 tube on it
don't want it to be in the way of mounting

i think i need to buy that solder scoop gadget cause i tend to redo a lot of my work still being badly inexperienced and all heheh

[Johnny Bravo]

[dinos22]

[dinos22]

been doing some testing

i can bench ~800MHz core linked with about 1.47v on that little stock cooler

absolute max RAM ~900Mhz

so LN2 this will easily hit 1GHz >> maybe 1.1GHz+

fingers crossed i can get my LN2 pot to sit properly on the core


here is a 3DMARK Vantage Performance run with 750/900 during early testing
http://service.futuremark.com/result...&resultType=19

P2429 on Skulltrail ROFL

[STEvil]

my core VR grounding point is also vRAM readout point

would that make a difference?

NOOO!!!

LOL


Incorrect ground point for sure.


Put your multimeter on the continuity setting (where it makes the beep noise when you touch the tips of the probes together) then hold 1 to the backing bracket (where the VGA/DVI connectors are) and probe the card to find a point which "beeps"... usually a ground leg on a capacitor or the 4/6/8-pin power connector works fine...


EDIT

I think we should clear something else up here

The point of a voltage mod is to create a divider in the circuit. The sensing pin (FB) sees X voltage and put placing the VR in parallel to the pin sensing voltage it draws away some of the power so it thinks the item getting X voltage (in this case the GPU) isnt getting enough and it overcorrects. If you do not use a point that is grounded then you have a lower potential to work with (or in your case a negative potential).

[dinos22]

NOOO!!!

LOL


Incorrect ground point for sure.


Put your multimeter on the continuity setting (where it makes the beep noise when you touch the tips of the probes together) then hold 1 to the backing bracket (where the VGA/DVI connectors are) and probe the card to find a point which "beeps"... usually a ground leg on a capacitor or the 4/6/8-pin power connector works fine...


EDIT

I think we should clear something else up here

The point of a voltage mod is to create a divider in the circuit. The sensing pin (FB) sees X voltage and put placing the VR in parallel to the pin sensing voltage it draws away some of the power so it thinks the item getting X voltage (in this case the GPU) isnt getting enough and it overcorrects. If you do not use a point that is grounded then you have a lower potential to work with (or in your case a negative potential).

thanks to you and Johnny for your advice

[N00B]

Got my new baby

XFX 8600 GT Fatal1ty



is there a big difference benching 3dmark2k1 and 2k with 2*512 2*1gb or 2*2gb , considering they have the same specs(mhz, timmings)?

[dinos22]

added some cap pr0n



i hope i did it right

reverse polarity as caps on the front of the card.....so these ones at the back were soldered + to -

does it matter that i used 1200 & 2200uF cap.........can it be too big??





here are the pics of front and back of the card for reference

[Johnny Bravo]

Dinos those are soldered the wrong way round

[dinos22]

really

youngpro told me to solder it in reverse

[Johnny Bravo]

well you add capacitors in parallel, and you certainly don't wanna get the polarity wrong on electrolytic ones cus they can explode

It should be negative to negative, positive to positive. I'm thinking YP probably meant that its the reverse from what you see at the front but who knows

[dinos22]

well you add capacitors in parallel, and you certainly don't wanna get the polarity wrong on electrolytic ones cus they can explode

It should be negative to negative, positive to positive. I'm thinking YP probably meant that its the reverse from what you see at the front but who knows

yeah you are probably right lol

and i just went for it hahahah

does the capacity matter??

[dinos22]

[Johnny Bravo]

yeah you are probably right lol

and i just went for it hahahah

does the capacity matter??

Yeah you can actually have too much capacitance, I found this in the last comp with the memory. Best thing is to test with and without and see if you get any gains - the capacitors are there to provide instantaneous current in order to stiffen the voltage. Therefore there job is to cope with load changes, however they will not fix a voltage drop, just a monetary droop.

Mixing the capacitance values isn't that big a deal really

OT, know how to improve stability of the 5:8 divider on the RE to get memory running at 7-6-5-15 1T @ ~2GHz ? I keep getting a "checkVRAM" coder on the LCD readout

[dinos22]

i'm only using it on vcore as i am going to feed monster vcore

i'll give it whatever it takes....so 2v+ here we come hahah

[STEvil]

I think he meant to reverse (rotate) the capacitor so the leads match on the backside (+ to +, - to -).

[G.Foyle]

i'm only using it on vcore as i am going to feed monster vcore

i'll give it whatever it takes....so 2v+ here we come hahah

I fed 2.15V into my 8400GS from last compo... that cards is still alive and kicking, my mate plays CS:S on it now

[STEvil]

went over 3.0v to mine

EDIT - 730/1600/800 at full stock is my best run through aquamark 3 for testing so far.

Asus Silent edition, 512mb DDR3 qimonda 1.4ns

[STEvil]

Fully stock card, two fans blowing on it (one on front, one on back) because the memory chips get retardedly hot...

CPU sucks, motherboard sucks (4x PCI-E only).. and absolutely not a single optimization or image quality change at all. No LOD, no mip, no nothing.

Manages AM3 @ 742/1836/800 giving ~ 107,500

[dinos22]

what vore voltage do you have at stock settings

around 1.25v??

[STEvil]

honestly, I dont know.... there's a bunch of caps that read as 1.33v and one that reads as 1.2v... memory is at 2.0v