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» The New Rebels Haven Forum!! » 64 Bit Motherboards, CPU's, and Operating Systems » MSI 64 Bit Motherboards » Vcore Mod for MSI Neo4 Platinum

Author Topic: Vcore Mod for MSI Neo4 Platinum Polygon Admin Member # 1 posted                    Here is a Vcore Mod for the Neo4-Ultra.... I don't know if the nF4-SLI and/or the Diamond use the exact same circuitry, so until further info comes in, this is for the Neo4 Platinum only.... 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... This is the Vcore Step-Down Switching Regulator chip that is the focus of our attention. It is an Intersil ISL6566 Pulse Width Modulator chip capable of up to 3 phase operation: The Functional Pinout shows that the mounting pad is the ground terminal: The ISL6566 typical circuit is a state-of-the-art, Step-Down Synchronous Rectifier type configuration: This topic closed until it's finished... -------------------- Too Many Computers,... Too Little Time ..... Damn Phenoms! Posts: 24294 | From: Fire Island, NY | Registered: Feb 2003 Polygon Admin Member # 1 posted                    Some quick calculations and resistance measurements, indicate that a 10K resistor soldered in place as shown below, will increase the Vcore by 10%.... This mod should not be tried until I get my board up and running again, and test the values. I fried the PC-e Video Card and I'll have a new one tomorrow... -------------------- Too Many Computers,... Too Little Time ..... Damn Phenoms! Posts: 24294 | From: Fire Island, NY | Registered: Feb 2003 Polygon Admin Member # 1 posted                    I temporarily connected a 10K resistor as shown above.... I did this with everything set to default values, so Vcore was set at 1.4V by the BIOS... The 10K resistor raised the 1.4Vcore to 1.54V, which is exactly a 10% increase... This mod is safe to do... Disclaimer: I take no responsibility for this mod. Be aware, there are no guarantees that you won't damage your board, CPU, and/or memory by doing this mod. The warranty will be void on the board if you do this mod.... -------------------- Too Many Computers,... Too Little Time ..... Damn Phenoms! Posts: 24294 | From: Fire Island, NY | Registered: Feb 2003 Polygon Admin Member # 1 posted                    We had a pretty good snowstorm here in the Northeast USA, and that means no way off this Island So, rather then waste the day, I soldered in the Mod with the intent of trying to solve the Winchester-on-Neo4 issue.... I choose a 50K, 15turn pot, without a series resistor because the small resistor solder point, is just too tiny to fool around with. I epoxied down the pot, cut and bent the leads to where I wanted them, and tinned the ends. I then bent the leads into the position where they would be soldered to, making sure they were touching the component. I then applied the slighest amount of heat from a soldering iron that has the smallest tip I could find. It took about 4 tries to get the smallest connection soldered without cooking the board Be aware that this is an extremely delicate operation that should only be performed by an experienced solderer! Here's the final Vcore Mod: -------------------- Too Many Computers,... Too Little Time ..... Damn Phenoms! Posts: 24294 | From: Fire Island, NY | Registered: Feb 2003 Robowang New Member Member # 1346 posted                    Polygon What pin of the IC are you connecting the VR to? I am assuming that one side is to ground. I have experimented with the mod for the SLI version as shown at ExtremeSystems. It just doesn't work correctly. When the resistance is adjusted for maximium vcore without hitting the overvolt (on the SLI, it looks to be right around 1.7v) funny things start happening to the on cpu memory controller, For example, my memory will run in dual channel 275fsb 2x HTT 2.5-3-3-7 at 2.65vdimm and the NF4 v set to 1.65v (single channel, way over 300 fsb). Will pass several runs of Memtest86 3.2 at these settings. When I connect the mod, maximiun vcore on my board is 1.64-1.68. When I set the vcore for anything over 1.54 (highest vcore WITHOUT mod), the memory will not pass test 5 or 8. And the higher the vcore, the more errors. After looking at the diagram that you present here of that IC (it is the same chip on the Ultra and the SLI), I think that persivore (in the ExtremeSysytems vcore mod thread)is correct in saying that the feedback line is not the best choice for the mod. The vsense line may be more appropriate. I can't see where the feedback line has any reference to the output, so changing the feedback line may just cause instability as the IC will "hunt" a balance. I don't have a schematic of the board, so I can't see where you would connect any external stimuli to the vsense, and with the multilayer board, really can't trace it by sight (OK, can't see up close either). From the diagram that you have, vsense is pin 12. What do you think? Have you had time to play with this mod, yet? Posts: 37 | From: Alabama | Registered: Mar 2005 Polygon Admin Member # 1 posted                    The resistor end that goes to the FB pin, pin 9, was too small to solder to... The Vmods are generally connecting a resistor from the FB pin to the ground pin.... The mod could be done to the Vsense line, but it's a harder mod... Didn't he cut a track and add resistors? I really never review anyone else's mods... I won't go any further with mods that what I have done here.... The motherboard doesn't know how the mod is done, so it does not matter. That said, the only issue with doing the mod my way, is that the leads can not be with several inches of wire long, and the ground that is used, must be very local to the power supply circuit... The FB pin is high impedance and very, very sensitive to noise pickup... I see pictures of mods where the wires to the resistor are all over the place... Evidently they are working most of the time... I only increased the Vcore by .1V.... Somewhere above that it shutdown on me... Other then that, it gave me no problems... Part of the "Modding Problem" with MSI boards is the "Core Cell"... It controls the overclocking settings and options and appears to interfere with "normal" modding.... -------------------- Too Many Computers,... Too Little Time ..... Damn Phenoms! Posts: 24294 | From: Fire Island, NY | Registered: Feb 2003 Robowang New Member Member # 1346 posted                    I see what you mean. .1v is enough for me, but the extra voltage is having an effect on my ram as explained above. I am going to wait until April Fools day and if MSI doesn't address this issue by then, I am going to put this board in my second box ans buy a DFI SLI and another CPU (maybe a 4000+) for my main box. It isn't like this board doesn't work ok `cause the 3200+ (at a paltry 1.47v)and ram (at 2.65v and 1:1)in it will hold a stable 2600mhz. That's close to a 30% OC. It's just that I am sure it will all go to the 9x300 if I could get a stable vcore of over 1.6. Maybe MSI will do something soon. I believe they can as you have said the Ultra will do more than 1.5 vcore from bios, so I would think the SLI could be made to do the same. Posts: 37 | From: Alabama | Registered: Mar 2005 Polygon Admin Member # 1 posted                    The extra .1V didn't solve any of the issues for me. The Neo4 Platinum has sufficient range on Vcore.... The DFI nF4 series is a great board. If I had a complaint it's just a few too many settings if that makes any sense at all... The Epox-9NDA3+ has only the std 200 1T 2.5-3-6-3 available to change and that board goes right to 345 with the right RAM... The Epox-NPA+Ultra same thing, but they have almost as many settings as the DFI.... I would assume the Epox SLI will/is as good... But the DFI is the popular board and not without reason... It's just super... -------------------- Too Many Computers,... Too Little Time ..... Damn Phenoms! Posts: 24294 | From: Fire Island, NY | Registered: Feb 2003 4Qman Full Member Member # 2180 posted                    This Forum Rocks. Ok im looking to do the Vcore mod on my MSI K8N SLI Platinum as its now max at 1.53v and ive tried to compare the pictures above to my board and they are different. If anyone has any links or pictures on my version of the board it would be a great help. Many Thanks. -------------------- www.4qman.co.uk S12 600w SLI PSU DFI Expert 12/07 Mod* Opteron @ 3Ghz Musukin 2-2-2-5 T1 250Mhz BFG 7800GT @ 570/1320 *Volt Modded* *WATER COOLED* Posts: 60 | From: England | Registered: Oct 2005 Polygon Admin Member # 1 posted                    Welcome to The Rebels Haven 4Qman! Post some close up pictures, in a seperate topic, of the power supply area including the PWM chip and I'll see what I can do... Anyhow, welcome aboard... -------------------- Too Many Computers,... Too Little Time ..... Damn Phenoms! Posts: 24294 | From: Fire Island, NY | Registered: Feb 2003 fw190r11 Senior Member Member # 782 posted                    You will have to find out what rev your mobo is and you can thank Polygon for all the effort he puts into this forum and all the money he spends on parts to see what works best so he can advise people on the best setup oh and his spare time working on computers thanks Polygon and yes this forum does rock -------------------- Epox EP-9NDA3+ ultra Amd 3000 winchester 290x9 2X256Meg A-Data Vitesta PC4800 Maze 4 polys cheap water cooling Radeon 9800pro 128mb Maxtor 160Gb ATA133 Tagan 480w psu Windows XP sp2 Posts: 173 | From: jersey | Registered: Jul 2004 4Qman Full Member Member # 2180 posted                    Thanks guys, ill take the picture and post the info need here latter. -------------------- www.4qman.co.uk S12 600w SLI PSU DFI Expert 12/07 Mod* Opteron @ 3Ghz Musukin 2-2-2-5 T1 250Mhz BFG 7800GT @ 570/1320 *Volt Modded* *WATER COOLED* Posts: 60 | From: England | Registered: Oct 2005 Polygon Admin Member # 1 posted                    If it's a different board, start a seperate topic. Thanks! -------------------- Too Many Computers,... Too Little Time ..... Damn Phenoms! Posts: 24294 | From: Fire Island, NY | Registered: Feb 2003

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