Uploaded April 2022 | Updated September 2026, 2 weeks ago

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I reveal the Secret Sauce to high-speed 68040 CPU overclocks and test new (Mar. '22) low-latency 60ns VRAM. Heatsinking, CPU fans, and gaming speed comparisons at 40.7 & 50.1 MHz are also shown. (Part I video: youtu.be/JrmzIcdBNOY )

🔎 INDEX
0:00 — Intro
0:32 — Secret Sauce
8:48 — Heatsinking the CPU
10:52 — Fan Cooling the CPU
19:24 — Faster CPUs with FPU
20:51 — Even Faster VRAM & New Spicy Mount!
23:21 — High Overclock Testing (51.6MHz unstable)
27:34 — 50.1MHz (stable)
33:15 — After 4 Months of Testing
36:58 — 50.1MHz Game Testing
47:33 — 40.7MHz Game Testing
56:42 — Conclusion
59:59 — Family Medical Emergency Update
1:01:41 — Final Words & Thanks

🛒 BUY
• Spicy O'Clock: bit.ly/3rTXzTG
• New Mystic Back Panel & Spicy Mount: tinyurl.com/yv52bbuz
• OS-CON capacitor Links in text description under Recap video: youtu.be/IOX7wmnoy4U
• Serial Cable (to make loop-back plugs for Snooper2): amzn.to/3znGeXn
See my post on TinkerDifferent for details: tinyurl.com/26se46jw
• 60ns 512K VRAM (Kay Koba): tinyurl.com/42vzj5vj
• 60ns 512K VRAM (Silicon Insider): ebay.com/itm/116435221772
• 60ns 512K VRAM (Drake/BetterBit): bit.ly/3LTNoa3
• UT Source 68040 CPUs (faked-markings possible): utsource.net/itm/p/891703.html
• Noctua 40x10mm Fan: amzn.to/3tNXzWy
(NOTE! See "🔩 FAN MOUNTING SCREWS" below.)
• 45x45x10mm Aluminum Heatsink 2-pack: amzn.to/3XO50vf
Also available in BLACK: amzn.to/3FDxOAn
And GOLD: amzn.to/43Pyixl
• Thermal Tape (25mm wide): amzn.to/3DPBvT3
-OR- instead of Thermal Tape, try this new Heatsink Clip with your favorite thermal paste:
• Heatsink Clip compatible with the above aluminum heatsinks: bit.ly/3KoojCS
• 64MB KEYSTRON RAM (for LC575/Mystic): ebay.com/itm/161121922148
• Torx T15 with LONG neck (to open Mac): amzn.to/2ScAskx
• Hakko Soldering Station (to install Spicy): amzn.to/4kEttgq
💁‍♂️TIP: Use 350°C & Leaded solder.
• Solder (Leaded Rosin Core 0.8mm): amzn.to/3GzJbVl

🔩 FAN MOUNTING SCREWS
• Machine screws (bolts): amzn.to/3ua5gWV
• Nuts: amzn.to/3QVB4s1
If either of the above go out of stock, here are the specs to find substitutes:
• Metric Size: M3-0.5 (M3=shaft diameter, 0.5=thread pitch, see below)
• Head Diameter: 5.3mm (much wider won't fit in the fan screw holes)
• Shaft Length (excluding head): 15mm
• Shaft Diameter: 3mm
• Thread Pitch: 0.5mm
• Type: Stainless Steel

💵 NOTE: Your price on Amazon (US only) is the same even if you don't click the "amzn.to" Affiliate links above, but if you do click & purchase within 24 hours, Amazon may pay me a small commission on qualifying items in your Cart.

💾 SOFTWARE
• My 1.4MB System 7.1 Boot Disk Image (for Mystic): bit.ly/3wVDmzM
• Clockometer 2.0.3 (DL#4): bit.ly/3uBMg4y
• Doom II: bit.ly/3tN708H
• Marathon: bit.ly/36UgyFM
• Dark Forces: bit.ly/3qLrNrb
• Wolfenstein 3D: bit.ly/3NGkCdV
• Duke Nukem Atomic: bit.ly/3NztnpS
• MacBench 3: bit.ly/35TNhdN
• Speedometer 4.02: bit.ly/34Snqmd
• Norton Utilities 3.5.3 (System Info): bit.ly/33oW5aS
• Photoshop 4.0: bit.ly/3tVPBdS

📚 REFERENCE
• CALCULATOR for Spicy's Potentiometer Setting: stephen-arsenault.github.io
• Potentiometer is 10% tolerance: bit.ly/3qSgm0Z
• My Benchmark Results (updated): bit.ly/3qTVEh8
• Intro to Spicy O'Clock: amba.to/3H66PJ7
• Manual for Spicy: bit.ly/3GWCXyu
• Main IC on Spicy (LTC1799): bit.ly/42BHzXs
• Stephen Arsenault's Open Source VRAM design: bit.ly/3BlDSHC
• TinkerDifferent thread about remarked/fake CPUs: bit.ly/3JtOiIb
• 68040 Mask info (scroll to "Masks" section): bit.ly/3oehISp
• More 68040 Mask Info: bit.ly/3ottjNn
• Power Mystic video by @Action Retro: youtu.be/ApgiLPsyOVA

🙏 MY SINCERE THANKS to these recent Paypal contributors:
• Ken Colangelo
• Mauro Acciaccaferri (monthly supporter)
• Fred in Atlanta (double thanks for a double donation!)
• Connor from San Francisco (big thanks!)
• Eric Helgeson (BlueSCSI creator: bit.ly/3NvkayW )

💰HOW TO SUPPORT THIS CHANNEL
paypal.me/supportJDW
(If you do very kindly donate, it would be a wonderful help if you could let me know if I have permission to use your full name, or use something like John in Texas, when I give you public thanks in a future video. Pronunciation help is also appreciated!)

📺 Please SUBSCRIBE:
youtube.com/c/JDW11/?sub_confirmation=1

🎬 MY VIDEOS
youtube.com/user/JDW26/videos

🎶 All music in the ending segment from Duke Nukem Atomic. (Game link in SOFTWARE section above.)

#Macintosh #ColorClassic #Overclocking #JDW