Sphere478 wrote on 2022-06-08, 20:30: We should get fritz involved here 😀 Have read your PMs and sorry I don't even have a Pentium MMX Overdrive yet to take pictures of the CPU (have only standard ceramic Pentium MMX).

Re did one with kryonaut, no dice, dud. I grab one of the better 570ACZ chips and tested it with the water block direct on die. 700MHz+ is still impossible, even with 2,5V (with higher voltages the system is not stable anymore...) DSC05083.jpg 2022-04-23_161602_919___2.4V_690MHz_256KB___cooled_with …

I'm curious about the water block your using with that cpu? An NexXxos XP made for Socket462. Just on a bench table direct on top of the cpu without a retention kit. That’s an amazing result. You should take that chip to the 3d mark 2000 aiming for the atars thread. What will it do on air cooling? …

So, the 570ACZ running very well with the full amount of 256KB L2 cache. 672MHz (112x6) @ 2.1V with Water and activated L3 cache 682Mhz (124x5.5) @ 2.2V with Water and no L3 cache 700MHZ+ are not possible (even with 2.4V) 2022-04-07_111637_306.png Beautiful work! Can you post 3d files? And where you …

Got a batch of these 570ACZ CPUs . Tested all with 128KB L2$, Water and 2,4V. The best one running @ 682MHz primestable. I moved the resistor of the best one, printed a frame for the heatspreader and using the clamp of der bauers delid die mate 2 to build up sufficient pressure. Thermal grease is …

Btw fritz, what equipment/method/settings temps/wattages are you using to move those resistors, your work is very clean. -pre tinning gold pad with solder iron -CPU with the pins on a camping hotplate at 180°C - 200°C -Hotair station at 240°C (low air speed) -some flux -waiting 30 - 60 seconds and …

Today I moved the upper left resistor. The L2 cache was completely disabled and the CPUid got the number 5C8 (it's a Chomper XT now) :-) You have got to be kidding me… ... Okay, so if there were more models to unlock I would expect to see non plus cpus that are on the 180nm process. But I don’t see …

Today I moved the upper left resistor. The L2 cache was completely disabled and the CPUid got the number 5C8 (it's a Chomper XT now) 😀 Filename DSC05064_cpuid_5C8.jpg File size 190.55 KiB Views 2510 views Filename 2022-03-06_031038_479.png File size 830.27 KiB Views 2510 views

Got a bunch of K6-2+ 450ACZ today. Picked one of them and was able test this mod successfully. AMD-K6-2+/450ACZ 2.0V CORE/3.3V I/O A 0030MPMW 2022-03-03_185604_393___57W_2.0V_550MHz_128KB___450ACZ_0030MPMW.png 2022-03-03_203944_045___60W_2.1V_550MHz_256KB___450ACZ_0030MPMW.png 2022-03-03_192310_355 …

Something like 260C made it pop off with a little bit of pressure from the craft knife. Pretty hot. A CPU with organic substrate would be scrap now. My favorite way to remove the heatspreader is rotation after cutting the sides with a razor blade or stove top scraper. K6-2+_delidding_step_a.jpg K6 …

Did some tests today and found out that the resistor can be removed completely to unlock the cache. My 500ACZM running very well with the unlocked cache. The CPU does not need a higher vcore for this mod and does not have a higher temperature or power consumption (system). K6-2+_500MHz_cache_mod.png …

why do your pics show the structure of the chip? it should be one color https://www.vogons.org/viewtopic.php?p=1024393#p1024393 Because these are my old exposed K6 chips. I put them on the ceramic package for clarification so that you can see the L2 cache on the chips. Here is the pic of my modded …

It works! 😀 After replace the capacitor back, it was still again a K6-2+ with 128kb L2 cache. Test this modification tomorrow at full speed. Today tested only with 180mhz.

Looks like, replacing the capacitor is the way to active the full amount of 256KB L2 Cache. CPUz recognize my K6-2+ now as a III+ with 256KB cache. 3DMark2000 score is also higher. Will now place the capacitor back to the original position, just to be sure...

Hi there! Interesting topic, but I don't think it is possible to reactivate the cache. The cache will most likely have been fused off or disconnected via lasercut on the die itself. But the chance that it depends on the package configuration, can also be true. So, I have picked out my old chips and …