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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: Miked on November 15, 2009, 04:40:15 AM
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Is there a particular version of the 68030 chip that is better than others for overclocking (e.g. the 68060 has certain masks that are more suitable for overclocking). I want to upgrade my 40mhz Derringer to at least 50mhz; however, I figured why not try to get a few extra mhz's in the process. I have searched for old threads as I vaguely remember someone overclocking to 52-56mhz (my memory is a bit hazy about the details).
Also, would 50ns ram make the process of overclocking more stable and/or feasible? I'd appreciate any help.
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MC68030RC50C is still being produced by Freescale. AFAIK, it's ROHS and LEAD free and generally runs at lower operating temperature.
Overclocking is possible, but probably not advised. I guess it won't make much difference even if you managed to get faster RAM. Main stability issue is glue logic (CPLD) chips which cannot provide safe response if overclocked above certain level.
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. I have searched for old threads as I vaguely remember someone overclocking to 52-56mhz (my memory is a bit hazy about the details).
Also, would 50ns ram make the process of overclocking more stable and/or feasible? I'd appreciate any help.
My memories are similar - probably never seen over 56 MHz mentioned.
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MC68030RC50C is still being produced by Freescale.
Sorry to pop into this thread, but on the freescale.com website it says that the "The MC68030 provides a code-compatible upgrade path to the MC68020". Does that mean that an 020 board can be upgraded to an 030 one with one of these processors?
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on the freescale.com website it says that the "The MC68030 provides a code-compatible upgrade path to the MC68020". Does that mean that an 020 board can be upgraded to an 030 one with one of these processors?
No
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No
:) Thought so ...
Thanks again
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Code-compatible should be regarded only from instruction point of view, since 030 is optimized version of 020.
Like Piru said, it's not a drop-in upgrade option.
I know it's hard, but you have to stay away from Windows-Intel philosophy
:)
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Keep in mind that actually buying a brand-new 030 CPU from Freescale will cost a hilarious amount of money. Also keep in mind that 50 mhz 030s are very, very rare in the used market.
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Is there a particular version of the 68030 chip that is better than others for overclocking (e.g. the 68060 has certain masks that are more suitable for overclocking). I want to upgrade my 40mhz Derringer to at least 50mhz; however, I figured why not try to get a few extra mhz's in the process. I have searched for old threads as I vaguely remember someone overclocking to 52-56mhz (my memory is a bit hazy about the details).
Also, would 50ns ram make the process of overclocking more stable and/or feasible? I'd appreciate any help.
50ns does help with overclocking but iv found that not all 50ns simms overclocked the same. all will give some inprovment over 60ns how much also depends on the card chipset.
here iv overclocked a Blizzard PPC with 80Mhz bus, but only 1 set of 128 simm modules will allow this kind of speed. my other 50ns simm modules will only allow around 75Mhz bus.
just for the record the Blizzard PPC will go all the way to 83Mhz bus (tops),but at this speed this PCI interface refuse to work,this test was done with AGA ( no SCSI ).
**** ALL MODIFCATION AT YOUR OWN RISK ****
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Keep in mind that actually buying a brand-new 030 CPU from Freescale will cost a hilarious amount of money. Also keep in mind that 50 mhz 030s are very, very rare in the used market.
parts are not that hard to find,you just have to have the right contacts,i have here some rare parts which was not that hard to find example PPC 604 375Mhz.
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My memories are similar - probably never seen over 56 MHz mentioned.
Let's change those memories then :-)
68030@64Mhz. Behold:
(http://www.amiga.org/gallery/images/2917/medium/1_WhichAmiga_030_64Mhz_vs._the_world.png)
http://www.amiga.org/gallery/index.php?n=3099
(http://www.amiga.org/gallery/images/2917/medium/1_SysInfo_030_64Mhz_vs._the_world.png)
http://www.amiga.org/gallery/index.php?n=3100
(http://www.amiga.org/gallery/images/2917/medium/1_AIBB_030_64Mhz_vs._the_world.png)
http://www.amiga.org/gallery/index.php?n=3101
In the AIBB tests the base system is an A3000@25Mhz. It's quite obviously eating dust! :-)
Also Doom (using latest ADoom, clean AOS3.1-40.42, no extras/patches/etc., KS3.0-39.106, no maprom stuff) feels better/smoother/more playable than on an A4000@25Mhz->31Mhz, but haven't really benched it. But on the A1200 rev.1D1 030@64Mhz w/ full SFX+music+MMU+FPS+AGA @ 320x200 NTSC LoRes+HUD showing, FORCEDEMO gave:
Blit wait time: 904us/frame (noMMU=995)
Safe wait time: 441us/frame (noMMU=485)
Chunky2Planar: 16396us/frame (noMMU=16479)
Note if you try to compare: clean OS vs. patched OS, SFX, music, screen size and showing FPS make a substantial difference in performance.
@Miked:
I guess to answer the original question: you can push the 030@40Mhz to 50Mhz with the right crystal, but as others said, the glue logic might not allow (my guess is it will since the CSA Derringer was 50Mhz capable - but on the Mega Midget Racer without RAM board+SRAM you can't go 50Mhz, that I've tried), but if it works, then make sure you add a fan to cool down the whole thing, especially in the cramped A500 case. I personally would put a small heatsink on the CPU/FPU and have a fan blowing sideways so as to cool more than just the CPU/FPU pair, because in the end those you can replace, but the soldered chips...?
Shameless plug: if you need crystal oscillators (or 68030@50Mhz/68882@50Mhz), I've got a number of them here:
http://www.amiga.org/forums/showthread.php?p=387665
http://amibay.com/showthread.php?t=1507
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This is the best post, with lots of data, that I've seen about this subject in a long time.
Bravo speed racer!
I have some questions:
What is the complete part number / mask for the 030 and 882 chips?
Are the CPU clocks, and or FPUclocks 60/40, or 50/50 duty cycle, if you know?
I saw your frequencies, but no manufacturers part numbers so I cant research this IMPORTANT difference in "clocks".
What type & qty of RAM(s) & its speed/part number?
I have never gone that fast on an 030, but I bet that machine feels pretty CRISP!!!