XP KT266A Voltage Mod - Who has the highest OC?
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Thread: XP KT266A Voltage Mod - Who has the highest OC?

  1. #1
    Join Date
    Jun 1999
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    XP KT266A Voltage Mod - Who has the highest OC?

    Hi All-

    I have a SOYO DRAGON Plus KT266A with an XP 1800+ currently burning in at aprox 1.7 GHZ (12*142) at default +.100 (1.85V) using a Swiftech MCX462 with 5 case fans (I know, sounds like a jet aircraft)! I am considering doing a voltage mod on the motherboard to get more out of her.

    Have any of you done this mod on any of your motherboards with XP processors? I would like to get an impression of what I can expect if I do the voltage mod.

    Please specify cooling methods and processor steppings.

    THANKS!

    Current Main Rig:
    AMD FX55 @ 2.9 GHz
    2 GB PC 3200 DDR RAM
    ABIT KN8 SLi motherboard
    ATI X1900XT O/C to XTX speeds

    Retired Rig:
    AMD Athlon XP 2500+ Barton @ 2387 MHz. (217*11)
    512MB DDR RAM @ 436 MHz. (PC 3700)
    Abit AN7 motherboard
    BFG GeForce 6800GT OC!

  2. #2
    Join Date
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    Lawrence, KS/Yukon, OK
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    Mine is a MSI K7T266 Pro2 (non-raid) with an XP 1800+ and a vantec FCE-62540D HSF (rheostat installed on the fan). A total of 6 case fans for the jet plane effect, only used when my case is all sealed up otherwise I don't use any.

    Right now running stable at 11.5x150=1725MHZ~2100+ speeds. There was some problems unlocking the chip, so it's still stock multiplier. Running at 1.85 Vcore and I think the ram is holding me back. It only runs at this speed when I set the ram bus to Hardware Clock -33.

    I need a site that shows how to volt mod my board so I can be sure it's the RAM though

    ------------------
    Stupidity should be painful.
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  3. #3
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    Jun 1999
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    This is probably what you are looking for, if your MB uses the standard voltage regulator chip. This is the cleanest and best worded voltage mod I could find:
    http://www.mods4me.com/reviews.php?o...nt&id=7&page=1


    Current Main Rig:
    AMD FX55 @ 2.9 GHz
    2 GB PC 3200 DDR RAM
    ABIT KN8 SLi motherboard
    ATI X1900XT O/C to XTX speeds

    Retired Rig:
    AMD Athlon XP 2500+ Barton @ 2387 MHz. (217*11)
    512MB DDR RAM @ 436 MHz. (PC 3700)
    Abit AN7 motherboard
    BFG GeForce 6800GT OC!

  4. #4
    Join Date
    Sep 2001
    Location
    Bloomingdale, IL, USA
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    5,206
    My board uses a voltage regulator made by SC. I thought that the chip I have was more widely used than the HIP chip, but maybe that's just on older (KT133A and older) boards, even though it pushes the same juice. However, I have pushed the Vcore to 2.35v, but that was using my watercooled peltier. I never let the temp get over 21*C under max load when I was doing this to burn it in...which ended up dropping my temps by 8*C. I now run my chip at 1.55v. I would not really recommend anything over 2.0v unless you have good cooling. I have also done an IO voltage mod on my board, allowing me to select up to 4.0v...which didn't help my memory hit any higher FSBs!!! I'm mad! At least I hope the problem is memory-related and not motherboard-related. I'm using PC133 RAM rated for a maximum of 3.6v.

    ------------------
    MSI K7T Turbo-R w/ 2.35v/4.05v mods
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    AthlonXP 1600+ @1700+ @ 1.55v
    256MB Corsair PC150 CL3 - hopefully MushkinREV3 soon
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    Intel Pentium 4 2.53B C1 @2.85GHz (stock volts), watercooled @ 27*C load
    MSI 865PE Neo2-P (i865PE + ICH5), 1GB PC3200 DDR RAM
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    Microsoft Windows XP Professional SP2

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  5. #5
    Join Date
    Jun 1999
    Location
    San Jose, California, USA
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    No one else?

    Looks like I will have to make the attempt!

    Current Main Rig:
    AMD FX55 @ 2.9 GHz
    2 GB PC 3200 DDR RAM
    ABIT KN8 SLi motherboard
    ATI X1900XT O/C to XTX speeds

    Retired Rig:
    AMD Athlon XP 2500+ Barton @ 2387 MHz. (217*11)
    512MB DDR RAM @ 436 MHz. (PC 3700)
    Abit AN7 motherboard
    BFG GeForce 6800GT OC!

  6. #6
    Join Date
    Oct 1999
    Posts
    3,198
    I had an XP 1800+ running as fast as 1772 MHz (11.5 x 154 MHz) on my voltage modded Shuttle AK31. The core was at 2.0V. Since I was air cooling, additional voltage didn't really help. I had the core at 2.05V to get my previous CPU, an Athlon 1.4, running at 1650 MHz (11 X 150 MHz).
    1.Old Antec Case, Asus PC-DL, 2 x 1.6 LV D1 Xeons @ 3 GHz, 2GB Corsair PC3200 @ 200 MHz, Chaintech 6800 128MB AGP

    2. Old Crap Beige Case, Gigabyte GA-H55M-S2H, Core i3 530, 4GB CL8 OCZ DDR3-1600, eVGA GTX465

    3. Asus Pundit mATX Case, MSI AMD Zacate E350/dual core E350IS-E45 mini-ITX, 4GB CL9 Crucial Ballistix DDR3-1333, LG Blu Ray/HD DVD & DVD Burner

  7. #7
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    Jun 1999
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    Do you think it was your memory or your CPU that stopped you at 1770?


    Current Main Rig:
    AMD FX55 @ 2.9 GHz
    2 GB PC 3200 DDR RAM
    ABIT KN8 SLi motherboard
    ATI X1900XT O/C to XTX speeds

    Retired Rig:
    AMD Athlon XP 2500+ Barton @ 2387 MHz. (217*11)
    512MB DDR RAM @ 436 MHz. (PC 3700)
    Abit AN7 motherboard
    BFG GeForce 6800GT OC!

  8. #8
    Join Date
    Oct 1999
    Posts
    3,198
    Twas the CPU, I think. The XP 1800+ wasn't totally very stable at 1772, so I backed if off to 1754 and finally to 1725. That final drop was due to the heat coming on for the winter instead of the nice cool airconditiong being on.

    The Athlon 1.4, on the other hand, was rock solid at 1618 MHz (10.5 X 154 MHz) so 154 MHz wasn't a problem for the Crucial PC2100 I was using. It ran there for a while before I tried the 11 X 150 MHz setting to get to 1650 MHz. And that wasn't really worth it because it benchmarked no better than the 10.5 X 154 MHz setting. I really haven't seen much success getting higher than 1750 or so on air cooling with XP 1800+ CPUs. I've seen guys go through the hassle of unlocking them, and they still get stuck around where I was. But maybe you'll have better luck.
    1.Old Antec Case, Asus PC-DL, 2 x 1.6 LV D1 Xeons @ 3 GHz, 2GB Corsair PC3200 @ 200 MHz, Chaintech 6800 128MB AGP

    2. Old Crap Beige Case, Gigabyte GA-H55M-S2H, Core i3 530, 4GB CL8 OCZ DDR3-1600, eVGA GTX465

    3. Asus Pundit mATX Case, MSI AMD Zacate E350/dual core E350IS-E45 mini-ITX, 4GB CL9 Crucial Ballistix DDR3-1333, LG Blu Ray/HD DVD & DVD Burner

  9. #9
    Join Date
    Jun 1999
    Location
    San Jose, California, USA
    Posts
    2,676
    Agree with you. Took a while to unlock mine and it will run at 1724 but will not do the 3dMark2001 bench unless I bring it down to about 1680 or less. Tried 11.5, 12 and 12.5 to change the FSB and she always halts about 1724 at 1.85V.

    I kinda thought that the voltage mod would only add 50MHZ at best if it is the chip, but, who knows. I may get bored with it and give it a go!

    I have an MCX462 so cooling is a lesser consideration.

    Current Main Rig:
    AMD FX55 @ 2.9 GHz
    2 GB PC 3200 DDR RAM
    ABIT KN8 SLi motherboard
    ATI X1900XT O/C to XTX speeds

    Retired Rig:
    AMD Athlon XP 2500+ Barton @ 2387 MHz. (217*11)
    512MB DDR RAM @ 436 MHz. (PC 3700)
    Abit AN7 motherboard
    BFG GeForce 6800GT OC!

  10. #10
    Join Date
    Oct 1999
    Posts
    3,198
    The voltage mod on the Shuttle AK31 was very easy with no soldering on the motherboard. The parts cost less than $5 and the procedure took less than 30 minutes, and I didn't even have to take the mobo out of the case, or the CPU out for that matter. And the XP 1800+ ran rock solid at 1725 MHz, so to me it was worth the effort.

    I only sold the Shuttle combo to raise cash for an Asus A7M266-D duallie rig. And I'm sorry I did. I got the Asus running and did a voltage mod on it too (the same mod as the AK31), but it just got too expensive. The Asus mobo had nothing onboard, no LAN, no RAID, no SCSI, no USB, just crappy C-Media sound. It only had 5 PCI slots, two of which were those 64-bit, 66 MHz ones. The C-Media sound causes stability problems and the Asus was just a Beta quality board at a very high price. Anyway, I sold it and wish I'd just kept the Shuttle. Although I am enjoying playing with my P4 1.6A rig right now.
    1.Old Antec Case, Asus PC-DL, 2 x 1.6 LV D1 Xeons @ 3 GHz, 2GB Corsair PC3200 @ 200 MHz, Chaintech 6800 128MB AGP

    2. Old Crap Beige Case, Gigabyte GA-H55M-S2H, Core i3 530, 4GB CL8 OCZ DDR3-1600, eVGA GTX465

    3. Asus Pundit mATX Case, MSI AMD Zacate E350/dual core E350IS-E45 mini-ITX, 4GB CL9 Crucial Ballistix DDR3-1333, LG Blu Ray/HD DVD & DVD Burner

  11. #11
    Join Date
    Feb 1999
    Location
    Jackson Tn USA
    Posts
    645
    VR Zone ha a review of the Shuttle AK35GTR KT333 board that has voltage settings above 1.85 check it out.
    http://www.vr-zone.com/reviews/Shuttle/AK35GTRv22/


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