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Post by ginz111 on May 4, 2009 0:53:32 GMT
I finally got around to doing the 1.5ghz overclock following the bitsandpieces.info directions. I am glad I went from 1.42 to 1.5 because I only had to remove four resistors and had to do no soldering. I can't imagine having to solder. I practiced on a sawtooth processor. I don't know how some of you guys can solder such small areas without screwing up. I don't think I could handle any of the higher overclocks because that would require soldering. I am happy with how it turned out though!
;D
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Post by aquamac on May 4, 2009 7:31:21 GMT
Nice! It is definitely worth doing, as it is fairly straight forward. Going higher eg 1.58 or 1.67 GHz usually results in the L3 crashing anyway. I tried on around 5 processors and only one worked with an occasional crash, but was OK if the L3 was independently cooled.
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Post by blacksheep on May 4, 2009 11:48:17 GMT
congrats ginz!! you made first (but i hope not last) step... @aqua: i have done two 7455B DP daughtercards (1.42 DP, 2 MB L3) to 1.58, and one to 1.67 GHz without any L3 crashes, with no additional L3 cooling. Stable as hell  I'm expecting troubles at 1.75 GHz (it requires higher CoreVoltage than 1.67), but i think, that is only matter of proper cooling. Regards |
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Post by aquamac on May 4, 2009 12:36:34 GMT
Glad to hear that Blacksheep. Actually 3 of the cards I did were dual 1.25's, so possibly not surprising. The dual 1.58 I did worked fine but when I sent it to it's owner, he said that it needed the extra cooling. Let me know how the 1.67 goes though - I will be really impressed!
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Post by blacksheep on May 4, 2009 17:44:56 GMT
Glad to hear that Blacksheep. Actually 3 of the cards I did were dual 1.25's, so possibly not surprising. The dual 1.58 I did worked fine but when I sent it to it's owner, he said that it needed the extra cooling. Let me know how the 1.67 goes though - I will be really impressed! It's explains a lot... to me. Mine two 1.25 DP daughtercards also had troubles at 1.58 GHz (1.67 not tried with them), so i downclocked them to 1.50 GHz - they runs fine till this day - i hope - i have sell them, and i have no negative news about it. My 1.42@1.67 GHz project is almost done (WC still in progress), in a few weeks i will finish it, and post here final results (with 7800GS and 2x1GB Corsairs XMS). Regards |
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Post by ginz111 on May 5, 2009 12:17:45 GMT
I am not done yet. I am working on getting a mounting plate made to watercool the mdd to overclock it some more. I think I am gonna hold off on my x86 project for a while to finish the mdd.
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Post by ginz111 on May 9, 2009 21:43:01 GMT
When you folks went to 1.58 what did you set your voltage at?
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Post by B B on May 10, 2009 7:58:55 GMT
A while ago I used this G4 MDD rad as a plate to insert a thermaltake waterblock .  I may buy another Dual 1,42Ghz and try again an oveclock around the 1,5 GHz and to watercool it. This is : the thread I wrote at the time. Two pix of the final result.   |
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Post by blacksheep on May 10, 2009 10:27:06 GMT
When you folks went to 1.58 what did you set your voltage at? I don't remember it precisely now, but it should be 1.65 or 1.70 V for 1.42 module (it might be depending on each individually, i think, correct me if i'm wrong). Now with 1.67 Ghz i have 1.75 V. Stock CV is 1.60 V in opposition to 1.25 DP, which has 1.55 V (as i remember). Mine two 1.25 (1 MB L3, from FW800) modules @1.58 GHz, were not stable even at 1.75 V (due to cache overheating, now i know it - Aquamac explained it very well). They worked fine @1.50 GHz with 1.60 V. On Bitsandpieces.info i found pics of 1.42 and 1.25 modules (both with 2 MB L3, first), but no photo of 1.25 1 MB L3 (from FW800). Here i found one misunderstanding: "This section refers to 1420MHz modules only..." - this is not exactly true  It refers also to 1.25 1 MB L3 module, cause its equipped with exactly that same voltage regulator: LTC3732CG. Both Dual FW800 modules have this chip, in a few days, i will know is the 1 GHz single from FW800 also... Regards |
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Post by ginz111 on May 11, 2009 1:10:53 GMT
I may buy another Dual 1,42Ghz and try again an oveclock around the 1,5 GHz and to watercool it. Do it!!! |
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Post by blacksheep on May 11, 2009 19:23:27 GMT
I may buy another Dual 1,42Ghz and try again an oveclock around the 1,5 GHz and to watercool it. Do it!!! Go further than around 1.5 Ghz: stable 1.75 GHz is not taken (by now, but i'm working on). I mean 7455B CPU of course |
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Post by ginz111 on May 12, 2009 13:47:02 GMT
right now I am shooting for 1.58 with air cooling. I just got to get a better pencil tip soldering iron.
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Post by ginz111 on May 12, 2009 13:51:11 GMT
Go further than around 1.5 Ghz: stable 1.75 GHz is not taken (by now, but i'm working on). I mean 7455B CPU of course Got any pics or can you tell us what you have up your sleeve for cooling? |
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Post by blacksheep on May 12, 2009 15:55:47 GMT
It's simple, and i have describe it in "1.42@1.67 DP review". I pushed my DeltaSHE (157 CFM) to the full speed and installed Aqua's Enable Nap script, and Chud Tools. I'm holding on about 2-3 hours of testing, no more (loudness is killing me). No crashes, no other issues. Temperatures are as i described before. That's why i'm going to watercool my MDD - i want to have quiet (or not louder than stock), fully functional machine. 1.75 GHz will be for testing only, to prove that is really possible to get it stable with this CPU. I think, that you should try some of Aqua's aircooling mods, described at his homepage. It should be enough to cool 1.42@1.58 GHz. |
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