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» The New Rebels Haven Forum!! » 64 Bit Motherboards, CPU's, and Operating Systems » Epox 64 Bit Motherboards » Vcore Mod for EP-9NDA3+ Rev 1.X (Page 1)

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Author Topic: Vcore Mod for EP-9NDA3+ Rev 1.X Polygon Admin Member # 1 posted                    Because Epox chose to only give us and additional +0.2Vcore, here's a Vcore mod for the 9NDA3+... Do not assume this exact mod will work on any other board. The power supply circuits are all slightly different.... -------------------- Too Many Computers,... Too Little Time ..... Damn Phenoms! Posts: 25194 | From: Fire Island, NY | Registered: Feb 2003 Polygon Admin Member # 1 posted                    NOTE: This Vcore Mod is for Rev 1.X boards only. The power supply circuit may be different on Rev 2.X boards.... If you do this mod, your doing it at your own risk. The Rebels Haven Computer Forum will not be responsible for damaged systems or components... If your unsure about the mods, I strongly suggest you do not implement them... OK, here is the circuit we're talking about. It's stragically placed above the CPU in order to distribute the Vcore amperage with as little loss as possible. The Epox-9NDA3+ uses a 3 phase step-down switching regulator for maximum efficiency. The PWM chip is a Intersil ISL6559 It's a 28 pin IC and has the referance designation of "U4": The Switching Regulator circuit is a typical, but state-of-the-art, Synchronous Rectifier, 3 phase circuit. -------------------- Too Many Computers,... Too Little Time ..... Damn Phenoms! Posts: 25194 | From: Fire Island, NY | Registered: Feb 2003 Polygon Admin Member # 1 posted                    Here's a close-up of where the resistor must connect to.... Pin 1 is by the "dot" in the lower left-hand corner. The pins are numbered counterclockwise. The IC is quite small and will take a precision solder job to not muck up the IC or the board... This is all preliminary and not ready for test yet... -------------------- Too Many Computers,... Too Little Time ..... Damn Phenoms! Posts: 25194 | From: Fire Island, NY | Registered: Feb 2003 Polygon Admin Member # 1 posted                    Success! Connecting a resistor from U4 pin 10 to pin 20, or any ground, increases the Vcore voltage.... Initial measurements show the the Vcore is very close to the BIOS set levels... It should be noted that 0.05V is automatically added to the Vcore default, as determined by the VID... So on a Winchester that is 1.4V default, the Epox board's power supply puts out 1.44V.... Here's the resistors to use and what voltage they yield: 22K(22,000 ohms): 1.44V increases to 1.50V 1.60V increases to 1.67V 10K(10,000 ohms): 1.45V increases to 1.60V The 10K resistor gives a 0.15V increase A 15K resistor will give about a 0.1V increase The 22K resistor gives a 0.06V increase Keep in mind that the other CPU's will start with 1.50Vcore and +.2 in the BIOS and +.15 from the resistor will yield a total of 1.85Vcore which I believe to be too much for any A64 CPU that wants a long life... So to sum it up, I recommend the following: Winchester CPU use 10K for a max of 1.75Vcore All other CPU's use a 22K for a max of 1.76Vcore DO NOT UNDER ANY CIRCUMSTANCES REDUCE THE RESISTOR ON PIN 10 TO GROUND BELOW 10K OR FAILURE OF THE BOARD AND CPU WILL OCCUR You are doing these mods at your own risk, while I have tried both 22K and 10K, I can not guarantee you will not fry your board.... Here's what mine looks like with a 10K resistor for the Mod: -------------------- Too Many Computers,... Too Little Time ..... Damn Phenoms! Posts: 25194 | From: Fire Island, NY | Registered: Feb 2003 bypolar Platinum Member Member # 80 posted                    I will head over to radio shack and pick up some resisters. great job. -------------------- In constant change!! Posts: 1715 | From: US | Registered: Jun 2003 Polygon Admin Member # 1 posted                    Thanks!... I'm going to do the mod with a 10K because I want to push the Winnie up a bit... Then at default, the FX55 will see 1.7Vcore... -------------------- Too Many Computers,... Too Little Time ..... Damn Phenoms! Posts: 25194 | From: Fire Island, NY | Registered: Feb 2003 bypolar Platinum Member Member # 80 posted                    I picked up a 10K-15turn Potentiometer. Content deleated for being wronge!! Polar -------------------- In constant change!! Posts: 1715 | From: US | Registered: Jun 2003 bypolar Platinum Member Member # 80 posted                    Ok, This is what I picked up. Putting my OHM meter on it it works like this: Termals 1-3 0K-OHMs to 10K-OHMs termals 1-2 10K-OHMs all the time Linky -------------------- In constant change!! Posts: 1715 | From: US | Registered: Jun 2003 Polygon Admin Member # 1 posted                    NO GOOD! A 10K pot adjusts from 10K to 0 ohms.... Someplace around 5-6K the board and CPU goes up in flames! If you get a fixed 10K also, you can put in series with the pot and now the adjustment will be 20K to 10K... That would be perfect.... -------------------- Too Many Computers,... Too Little Time ..... Damn Phenoms! Posts: 25194 | From: Fire Island, NY | Registered: Feb 2003 Polygon Admin Member # 1 posted                    Here is a picture of what to do with a 10K pot. You need to get a 10K resistor also... -------------------- Too Many Computers,... Too Little Time ..... Damn Phenoms! Posts: 25194 | From: Fire Island, NY | Registered: Feb 2003 bypolar Platinum Member Member # 80 posted                    Ok, yes you are right anything Less than 10K would be no good. I have the pot hooked up to be a solid 10K. This is using termals 1,2 they make a unchanging 10K OHMs The Pic I took is crappy but you can see the grabers and the pot. It works!! When bios is set to .05 Vcore reads 1.6V in the bios and 1.58 in USDM and CPU-Z. .10 in the bios makes 1.66Vcore .15 makes 1.71Vcore. Never tried .20 if nothing starts to smoke this is great!! -------------------- In constant change!! Posts: 1715 | From: US | Registered: Jun 2003 Polygon Admin Member # 1 posted                    A fixed 10K is perfect..... Go for the max!!!! Let's see some new higher clocks... -------------------- Too Many Computers,... Too Little Time ..... Damn Phenoms! Posts: 25194 | From: Fire Island, NY | Registered: Feb 2003 bypolar Platinum Member Member # 80 posted                    I will be doing some testing, would be cool if I could get superPI @ 2.8G and a prime stable 2.6G -------------------- In constant change!! Posts: 1715 | From: US | Registered: Jun 2003 Polygon Admin Member # 1 posted                    Added pictures of my actual modification.... Now off to the test bench...! -------------------- Too Many Computers,... Too Little Time ..... Damn Phenoms! Posts: 25194 | From: Fire Island, NY | Registered: Feb 2003 bypolar Platinum Member Member # 80 posted                    Here are some clearer pictures on how I did it. I do not have the solidering skills that Poly has By a Long shot. Radio shack Parts Precision Mini-Clips # 278-016A Cermet Potentiometer 10K Ohm-15 turn # 271-343 ...Note: Only termals 1,2 can be used on the Potentiometer they are clearly marked. The grabers have a curved end I had to clip 30% of the curv off so they would grab the termals on the IC. -------------------- In constant change!! Posts: 1715 | From: US | Registered: Jun 2003

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