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Thread: Major vCore drop on EP45-UD3P (v1.1)




  1. #1
    Join Date
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    Milwaukee
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    Default Major vCore drop on EP45-UD3P (v1.1)

    I just bought this board used and put in my computer last night. I was previously using a Gigabyte P35-DS3P and did not experience this problem. (BTW: Hi, Im new here. Forum was recommended to me by someone on another site)

    My configuration is as follows:
    Intel Q6600 G0 (stock settings right now)'
    Thermalright Ultra 120 Extreme
    2GB Adata 5-5-5-18 (Cheap stuff Im borrowing from my friend until my Gskill RAM gets back from RMA)
    Gigabyte GA-EP45-UD3P v1.1
    BFG Tech GeForce 8800GTX
    Auzentech X-Fi Prelude
    Dlink DWA-552 Wireless adapter
    Corsair HX620 Power Supply
    2x SATA DVD-RW drives
    2x 160GB Western Digital Caviar SE (RAID 0 on ICH10)
    1x 250GB Western Digital Caviar SE
    2x 1TB Western Digital Green
    7x 120mm case fans (3 pull power from the motherboard, 4 pull power from 2 molex connectors that dont pass through to anything else.)
    Windows 7 Professional 64-bit

    So now to the problem. The board came flashed with the F10f bios and all settings were at default (default for this board is an 8x CPU multi). I bumped the multi up to 9x and kept all the voltages on auto figuring that it should be fine since these are stock settings. Booted fine into the OS (which I did not reinstall) and I fired up Prime95 to let it run and help set the newly applied AS5. It failed within 3 minutes (Blend test).

    So I went back into the bios, turned the voltage settings to "normal" and restarted. It booted up and I started Prime 95 again with CPU-Z opened. On load, the vCore drops to .976v. It doesnt matter what I do. Before all this, I had already disabled C1E, EIST, CIA2, and enabled LLC. I even tried to set the voltage settings manually and bumped a few values a little higher than normal. I set the vCore to 1.275v. The BIOS read it as 1.23v and CPU-Z read it as 1.22v. As soon as Prime95 started, the vcore dropped to .976v again.

    So I cleared the cmos, reinstalled the OS, left all the voltages on auto but turned off C1E, EIST, CIA2, LLC=disabled, and disabled a whole bunch of other stuff I dont use.

    Currently running at 266MHz x 8 = 2133MHz (underclocked Q6600) and stressing it with Prime95 (Small FFTs). Voltages still read .976v as can be seen in the screenshot, but its stable (lol). This is under load. Idle voltage is 1.20v

    Any ideas what is causing this?
    Last edited by shiarua; 11-12-2009 at 09:43 AM.
    Quote Originally Posted by Higgins
    Pro tip: don't piss off PC gamers on purpose

  2. #2
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    Default Re: Major vCore drop on EP45-UD3P (v1.1)

    Have this from OCCT. As you can see, the vCore drops when you put any load on the CPU.
    Quote Originally Posted by Higgins
    Pro tip: don't piss off PC gamers on purpose

  3. #3
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    Default Re: Major vCore drop on EP45-UD3P (v1.1)

    It looks to me like there's something wrong with the board in some way. As you say all power saving settings are disabled and LLC is on. You should be getting at least ~1.2V when loaded.

    I would return the board to where you bought it for an exchange. Tell them what it's doing and that any CPU you try is unstable at stock settings because of it. They should swap it for you right away.
    Coolermaster CM 690 II advance Case
    Corsair HX750 (CWT, 91%(80+ Gold rated @230V) single 62A 12V rail
    P55A-UD4 v2.0 @ F14
    Core i5 760 @ 20 x 201, 4.02GHz
    TRUE Black with a single Noctua NF-P12 pumping out 55 CFM @ 19db .
    2 x 2GB Mushkin Ridgeback (996902), @ 7-10-8-27, 2010-DDR, 1.66v
    2 x Gigabyte GTX 460 1024MB in SLI (Pre OC'd to 715MHz core and 1800MHz VRAM) @ 850 Core / 4100 Mem.
    Intel X25-M Boot Drive (OS and Programs) 200MB/s Read & 90MB/s Write
    Corsair X32 200MB/s Read & 100MB/s Write
    WD Caviar Blue 640GB C (Steam, Games, Storage, Temp Files & Folders, etc)
    Samsung F3 500GB Backup/Images
    Noctua 1300RPM 19dB case fan (rear extraction)
    3 x 140 MM Coolermaster LED fans (one front intake, one top extraction, one side intake)
    Dell Ultra Sharp 2209WAf E-IPS @ 1680x1050

  4. #4
    Chike is offline Senior Member
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    Default Re: Major vCore drop on EP45-UD3P (v1.1)

    Boared came with F10f BIOS and "defaults" to 8 CPU Ratio? IMO you will not be the first one to return it, let alone open the box.

  5. #5
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    Default Re: Major vCore drop on EP45-UD3P (v1.1)

    Quote Originally Posted by Chike View Post
    Boared came with F10f BIOS and "defaults" to 8 CPU Ratio? IMO you will not be the first one to return it, let alone open the box.
    Yea, well. I reflashed the BIOS to F9 to see if it would work, and it didnt. But when you clear the CMOS, the board does default to an 8x multi

    Im gonna throw my GA-P35-DS3P back in today and see if it's either my CPU or PSU. Im thinking this is a problem with the motherboards VRMs, but not sure.

    Thanks for the responses.
    Quote Originally Posted by Higgins
    Pro tip: don't piss off PC gamers on purpose

  6. #6
    Chike is offline Senior Member
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    Default Re: Major vCore drop on EP45-UD3P (v1.1)

    Quote Originally Posted by shiarua View Post
    Yea, well. I reflashed the BIOS to F9 to see if it would work, and it didnt. But when you clear the CMOS, the board does default to an 8x multi
    It should default to the CPU max multiplier, but I've seen some anomalities like it around, either multiplier or wrong reported CPU FSB/CPU speed.
    Give it a long 20 minutes clear, maybe a couple of hours, see the second part of http://forums.tweaktown.com/f69/bios...76/#post258596

  7. #7
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    Default Re: Major vCore drop on EP45-UD3P (v1.1)

    Yea, I took the battery out for 20-30 min while I reseated the CPU and redid all the connections to make sure everything was properly connected.

    Also, on another note, the BIOS feels "glitchy", even the final F9 version. Whenever Im on the voltage settings screen in the M.I.T. section, going back and forth between values is slow and the text kind of flickers. I dont know if this is normal.
    Quote Originally Posted by Higgins
    Pro tip: don't piss off PC gamers on purpose

  8. #8
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    Default Re: Major vCore drop on EP45-UD3P (v1.1)

    Yes, a slight hesitation on the BIOS screen and a little flicker/blinking is nothing to worry about. Happens to me too. Also if I type voltage values too fast there's either a delay before the value appears on screen or it misses a number out, kind of like there's no/too little keyboard character buffer.

    Definitely sounds like as you say a VRM issue or some other odd hardware fault.
    Coolermaster CM 690 II advance Case
    Corsair HX750 (CWT, 91%(80+ Gold rated @230V) single 62A 12V rail
    P55A-UD4 v2.0 @ F14
    Core i5 760 @ 20 x 201, 4.02GHz
    TRUE Black with a single Noctua NF-P12 pumping out 55 CFM @ 19db .
    2 x 2GB Mushkin Ridgeback (996902), @ 7-10-8-27, 2010-DDR, 1.66v
    2 x Gigabyte GTX 460 1024MB in SLI (Pre OC'd to 715MHz core and 1800MHz VRAM) @ 850 Core / 4100 Mem.
    Intel X25-M Boot Drive (OS and Programs) 200MB/s Read & 90MB/s Write
    Corsair X32 200MB/s Read & 100MB/s Write
    WD Caviar Blue 640GB C (Steam, Games, Storage, Temp Files & Folders, etc)
    Samsung F3 500GB Backup/Images
    Noctua 1300RPM 19dB case fan (rear extraction)
    3 x 140 MM Coolermaster LED fans (one front intake, one top extraction, one side intake)
    Dell Ultra Sharp 2209WAf E-IPS @ 1680x1050

  9. #9
    Join Date
    May 2009
    Location
    Canada
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    Default Re: Major vCore drop on EP45-UD3P (v1.1)

    Wow that is quite a reduction in voltage. It would be interesting to us a DMM to check your other voltage rails when idle and load. Perhaps, try removing the 3 fans from the mobo fan headers use the psu connectors and see what happens to vcore, and to the other voltage rails.
    1) Gigabyte EP45-UD3P (rev 1.1, bios F9) E8400 @445x9@1.2625v bios, TRUE 120, Scythe UltraKaze 44cfm, 4x2gb GSkill 8500, Visiontek 3870, Corsair TX850, Antec 900, Win7-64 Home.
    2) Gigabyte EP45-UD3P (rev 1.1, bios F9) E8400 @500x8.5@1.2875v bios, TRUE 120, Schythe UltraKaze 44 cfm, 4x2gb Buffalo FireStyx 8500, XFX 5770, Corsair AX850, CM Scout, WinXP Pro/Win 7-64 Home.
    3) Gigabyte P55A-UD4P (rev 1.0, bios F5) i5 750 @190x20@1.30625v bios, CM Hyper 212+, 4x2gb G.Skill Ripjaw 1600, 7900GS, Corsair TX750, CM Scout, Win7 Pro-64.
    4) Asus P8Z68-V Pro (bios 0801), i5-2500K @44x100@1.248v cpuz, Megahalem rev.B, 4x4gb GSkill Sniper 1600, Corsair AX850, Antec 902, Corsair Performance 3 128GB, Win7-64 Home.


  10. #10
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    Default Re: Major vCore drop on EP45-UD3P (v1.1)

    Put my other Gigabyte board back in my computer (P35-DS3P) and everything is fine. I get drops from normal vcore (1.25v) to 1.2v with LLC enabled, but nothing huge like .2v+. This is under load.

    The board also reads the multi fine. Unfortunately I dont have a dmm for testing psus.
    Quote Originally Posted by Higgins
    Pro tip: don't piss off PC gamers on purpose

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