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Post by Mr.Scott on Nov 24, 2017 10:33:05 GMT -5
Haven't done anything constructive in a while, so how about a worklog modding an NF7. Here is a virgin board I just pulled out.All cleaned up and ready to mod. A1 version NB. Already tested to 250 FSB before I started the log.
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Post by Mr.Scott on Nov 24, 2017 10:54:04 GMT -5
I'll be using this small adjustable buck converter for power on the vdimm mod. 5v in from PSU to any vdimm up to 5v. 3.6v will be my usual goal here. FWIW, I do own an OCZ Booster, but what fun is that. Anybody can do that. Output of converter goes to the output side of the vdimm mosfet (in yellow). VTT will track automatically up to about 3.5v vdimm on a NF7 so no VTT mod will be necessary.
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Post by Vinster on Nov 24, 2017 12:55:52 GMT -5
where do you get your Buck Converters?
Vin
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Post by Mr.Scott on Nov 24, 2017 13:23:34 GMT -5
That is a cheap ebay one. I think I bought 6 for 10 bucks. They work pretty good except I added a small heatsink to them. Got a little warmer than I liked.
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Post by Macsbeach98 on Nov 24, 2017 16:12:59 GMT -5
Nice board looks in good condition. What chip is on that Buck converter? you havent got Heatsinks on all of them yet.
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Post by Mr.Scott on Nov 24, 2017 16:48:30 GMT -5
What chip is on that Buck converter? LM2596 Pretty common, nothing special.
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Post by ozz on Nov 24, 2017 18:58:05 GMT -5
i know what youre up to scotty, youre gettin that nf7 ready for shrimpys team captains comp , sneaky sneaky
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Post by Mr.Scott on Nov 24, 2017 19:23:54 GMT -5
lol Kinda. AN7 ain't gonna cut it for SPI, and my Ultra B has it's limits. Needed to get this board done anyway so......... Still might wind up on the Ultra B anyway. We shall see. Always had a thing for NF7's.
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Post by ozz on Nov 24, 2017 19:26:24 GMT -5
lol Kinda. AN7 ain't gonna cut it for SPI, and my Ultra B has it's limits. Needed to get this board done anyway so......... Still might wind up on the Ultra B anyway. We shall see. Always had a thing for NF7's. lol its gunna be fun to watch the battle of the masters
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Post by Mr.Scott on Nov 24, 2017 19:28:27 GMT -5
I don't really consider myself a master. I just have some decent hardware.
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Post by ozz on Nov 24, 2017 19:51:57 GMT -5
I don't really consider myself a master. I just have some decent hardware. you might not scotty but many others do, modesty will get you nowhere my friend , ive seen you blokes pull many a rabbit out of the hat in the past few years
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Post by Mr.Scott on Nov 25, 2017 15:33:24 GMT -5
VDD mod is complete now. I opted for the pencil method, mostly because my carpul tunnel is acting up today and I can just about feel my fingers, so no fine soldering today. Starting resistance was 577 ohms. After a few pencil strokes across the resistor, it now reads 504 ohms. That should yield me about a .2v increase in NB voltage. Perfect. That will get me to 2.0v. Board is complete. All heatsinked and ready for battle.
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Post by Macsbeach98 on Nov 25, 2017 16:15:25 GMT -5
Ah yes I see your pencilled resistor. All looks good where did you attach your Buck controller to the leg of the associated Cap or is there section you can scrape the screen off to expose copper?
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Post by Mr.Scott on Nov 25, 2017 16:29:21 GMT -5
Attached on the back of the board. There is a pretty large pad next to the leg pin. A little light scrape and you're in business.
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Post by kotori on Nov 26, 2017 1:54:42 GMT -5
Thanks show us this mod Scotty, It looks easy and useful.
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Post by kotori on Nov 26, 2017 7:29:48 GMT -5
NF7 is sometimes turns into a bomb, before, cpu side mosfet exploded and broken piece hit my face. I have broken the seven Socket A boards so far, 4of NF7, ultraA, AN7,N2view.
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Post by Mr.Scott on Nov 26, 2017 8:00:06 GMT -5
I've blown up my fair share also. 2 NF7's, 2 AN7's, 1 Ultra B, 1 cheap Asrock board
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Post by kotori on Nov 26, 2017 8:40:14 GMT -5
I think Socket A motherboard is most breakable platform, but fan
BTW Scotty, Buck converter output voltage equal vdimm?
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Post by Mr.Scott on Nov 26, 2017 9:40:12 GMT -5
BTW Scotty, Buck converter output voltage equal vdimm? Yes. No need to adjust vdimm in the bios with this. Buck converter is totally adjustable. There are only a few boards you can get away with this on. AN7 and Ultra B cannot do this. AN7 has OVP at 3.2v and Ultra B will just plain blow up.
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Post by kotori on Nov 26, 2017 11:04:19 GMT -5
BTW Scotty, Buck converter output voltage equal vdimm? Yes. No need to adjust vdimm in the bios with this. Buck converter is totally adjustable. There are only a few boards you can get away with this on. AN7 and Ultra B cannot do this. AN7 has OVP at 3.2v and Ultra B will just plain blow up. Thank you, I don't have a living NF7 now, first i need to get it ,especially immortal one.
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Post by Mr.Scott on Nov 26, 2017 11:43:19 GMT -5
Board is up and running. Couple notes here:
VDD mod is acceptable. Max VDD is 1.96v. Right where I needed it. Buck converter has a little vdroop. Needs to be set at 3.7v to output a solid 3.5v Board limits vdimm. Best actual vdimm I could get with the OCZ Booster was 3.4v With this setup I get an actual 3.5v at the dimms. Worth it? Eh.....if you're an overclocker every tenth counts. I claim it as a victory.
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Post by Macsbeach98 on Nov 26, 2017 16:22:20 GMT -5
What was wrong with your booster? On my NF7 the booster will go to 4v I am sure I have had it at 3.8 dropping to 3.7 while running and there was more in it I will have it going soon. What voltage you got the Buck plugged into get it off the 5v and onto the 12v remember to wind the trimmer down first. There is a voltage drop with those you dont get the output that you input. What is it rated for. Max Input = 36v Max Output = 30v Or something similar.
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Post by Mr.Scott on Nov 26, 2017 17:07:55 GMT -5
What was wrong with your booster? On my NF7 the booster will go to 4v I am sure I have had it at 3.8 dropping to 3.7 while running and there was more in it I will have it going soon. What voltage you got the Buck plugged into get it off the 5v and onto the 12v remember to wind the trimmer down first. There is a voltage drop with those you dont get the output that you input. What is it rated for. Max Input = 36v Max Output = 30v Or something similar. Nothing wrong with the booster. The ram runs better in the first and third slots. Booster takes my first slot if I use it. Booster will read 4v but the actual measured at the dimms is only 3.4v. The buck is doing the same thing + a tenth. Buck max input is 40v, output 36v I will try 12v input. Never thought of using it. Figured 5v I'd never need more.
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Post by Macsbeach98 on Nov 26, 2017 19:44:10 GMT -5
Generally forward bias for a diode / transistor is around .6v if the regulator has 2 transistors in a darlington arrangement or something similar there is at least 1.2v or more your output will be below the input. I am interested to see how you go running off the 12v rail. The same thing applies if you raise the 3.3v rail to 3.6v you will never get 3.6v out of a voltmod for memory 3.4 is the most you can likely expect in most situations because of the transistor forward bias.
I didnt know that the ram worked better in the first and third slots interesting. I run the booster in the first slot and ram in second and third and I clip a clip on to the leg of the mosfet that you have shown in your first pic and have had the voltage reading there as high as 3.8v I actually didnt know that there was a voltage limitation between the output of the regulator and actual Vdimm.
One thing beware of connecting the booster to a board that doesnt suit I connected it to the DFI Nforce2 Rev A that I got from Scruffy and started turning the pot up watching for voltage increase and poof a puff of smoke and 2 burnt mosfets on the booster didnt affect the board though it was still working Ok afterwards.
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Post by Mr.Scott on Nov 26, 2017 19:56:53 GMT -5
Made a cable for 12v. I'll change that tomorrow. Kinda interested also. NF7 tip. It's basically my only reason for doing this. Otherwise I would just stick to the booster. I didn't either, but that's what I'm seeing with a DMM. Wonder if it has to do with resistance when the traces split to go to the individual slots. Smaller track, more resistance. Dunno. Just guessing.
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Post by ozz on Nov 26, 2017 20:09:02 GMT -5
^^^^^^^ and you blokes wonder why i called yas masters
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Post by Aleslammer on Nov 26, 2017 21:56:38 GMT -5
No booster here so watching this pretty close.
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Post by Bones on Nov 27, 2017 16:16:29 GMT -5
Been wanting to do the dirty punk mod to mine complete with a way to turn it on or off as desired/needed. If I were to really try it, believe I could get more than 3.3v's once I work things out completely along with the ability to turn it on as I want.
Could be another soldering project to do for the helluvit.
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Post by Mr.Scott on Nov 27, 2017 17:01:41 GMT -5
The converter is pretty much the same as the dirty punk mod except you're using the converter as the source of power.
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Post by Macsbeach98 on Nov 27, 2017 17:34:23 GMT -5
But you cant turn the dirty punk mod down so its only for BH5.
I have got a few of those Buck controllers in the cupboard I am seriously thinking of trying one
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