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Abit Av8 & A64 3400+ overclock troubles
Hi all. I'm trying to get this Abit AV8 and A64 3400+ combination to
rise to a respectable overclock without errors in Prime95 and having a very hard time doing so. I'm assuming the 3400+ chip is NewCastle core and rated for 2.2Ghz; the die is stamped with ADA3400DEP4AZ and an XPMW 4-letter code. I've got a Zalman AlCu cooler with a fan than can only reach 2400RPM. The heat reaches an incredible 80C on some CPU voltage/bus combinations (during Prime95). Also, I've recently flashed the AV8's bios to the new version 24. It looks like keeping the multiplier at 11 isn't the way to go and I'm having some luck at 10.5 and 2289Mhz (but I really think I could do better). I'm aiming to be milder at my CPU voltage bumps and this is definitely helping the heat problem w/o sacrificing stability. Given that I'm a OC noob, I'm hoping that someone has some insight into this CPU/mobo combination or can offer some general hints. Anything pertaining to LDT speed and HTT multiplier would help too. thanks. |
#2
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Newcastle's (130nm core)generally do not o/c as well as Winchester(90 nm
core), which do not o/c as well as Venice(90nm with improved memory controller and extra tweaks) Myself have Winchester at 9x270 for 2430 MHz at 1.575V.Have Corsair XMS PC3200 memory running on the 333 divider (in BIOS)so effectively it's running at 333/400'ths of 270 MHz which works out at 225 ish MHz.This is at Cas2.5(won't run at 2.0) and 1T command rate.This keeps memory close to 200 MHz I have dropped the LDT multi to 4x.The LDT bus is designed to run at 1GHz(5x200), so once you o/c the fsb you are effectively o/c ing the LDT.You need to keep any LDT combo around the 1000 mark otherwise it often won't post.Mine is 4x270= 1080.The LDT does not have much effect on overall performance anyway, unless you run a 1x LDT multi and even then it is minimal(5 or 10% performance drop).I could run 2x on the LDT with no measureable difference. Do not use the 3x multi on the LDT as Via( or could be just AV8, not sure) boards don't like it( use 2x or 4x). Not sure on Newcastle's, so i think 2290 is probably around your limit.I would definitely reseat your heatsink.80 C is a bit much. Try a 9x multi with more fsb.I'm assuming you have PC3200 memory.This will help a good deal. Be aware that Newcastles run at 1.5V standard, whereas Winnies run 1.4V(ie less heat produced).I think around 1.65V should be your maximum, but watch the temps. BTW did a search at AMD webby and your chip ADA3400DEP4AZ is not listed? -- SteveH Abit AV8 Third Eye v1.1, A64 3200+ at 2430(9x270),1.575V CPU DIY watercool Radeon Sapphire 9700 "marko" wrote in message oups.com... Hi all. I'm trying to get this Abit AV8 and A64 3400+ combination to rise to a respectable overclock without errors in Prime95 and having a very hard time doing so. I'm assuming the 3400+ chip is NewCastle core and rated for 2.2Ghz; the die is stamped with ADA3400DEP4AZ and an XPMW 4-letter code. I've got a Zalman AlCu cooler with a fan than can only reach 2400RPM. The heat reaches an incredible 80C on some CPU voltage/bus combinations (during Prime95). Also, I've recently flashed the AV8's bios to the new version 24. It looks like keeping the multiplier at 11 isn't the way to go and I'm having some luck at 10.5 and 2289Mhz (but I really think I could do better). I'm aiming to be milder at my CPU voltage bumps and this is definitely helping the heat problem w/o sacrificing stability. Given that I'm a OC noob, I'm hoping that someone has some insight into this CPU/mobo combination or can offer some general hints. Anything pertaining to LDT speed and HTT multiplier would help too. thanks. |
#3
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Thanks. I'm getting 2400Mhz after putting my memory to DDR333 and
relaxing the memory timings. My memory is PC3200 but not the highest quality. Its reaching as high as 82C during Prime95 but its stable for 12 hours before I ended the test. I agree I need to do something about the heat and will probably re-seat. Watching the speedfan monitor, the temp drops immediately as soon as the load is lifted, so its hard to believe that the HSF isn't seated well enough, but I'll take a look at it. |
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