Is it safe? I don't think any fires are going to break out, if that's what you mean, though I might want to make sure that the fan was working, and one strategy might be to turn it over so that it sucks cold air up into the case rather than pushing warm air out. "Danamania," one of the old admins around here, used to use this strategy when overclocking Quadra 605s with much hotter full 68040 processors installed, and found it cooled more effectively that way.
Will your 68882 work at 33MHz? You need to find out if it is really working at the moment, since mostly it is ignored. So, run a program that uses the FPU and see what the results are (benchmarking utilities are some of the very few Macintosh programs that actually use the FPU, along with high-end CAD, graphics applications, spreadsheets and screensavers like After Dark, seemingly).
Certainly some LCIIIs (25MHz) shipped with a 68030 marked at only 16MHz. The Performa 460 (or LCIII+) is just a speed-bumped LCIII, and I would not be the slightest surprised if everything in it with the exception of the oscillator controlling the speed were not identical to what is in the average LCIII; in general, 68030s seem to be willing to be overclocked fairly generously. In general, the speeds Apple set its hardware at in the early 90s were controlled as much by marketing criteria and the associated profit lines of the company than they were by the hardware's inherent capacity (e.g., a IIsi can run as fast as a IIci, except that it can't because it was deliberately hobbled so as not to compete with the much more expensive IIci).
The 68882 is most likely much the same animal as the 68030, but YMMV. The proof of the pudding will be in the eating.
Will your 68882 work at 33MHz? You need to find out if it is really working at the moment, since mostly it is ignored. So, run a program that uses the FPU and see what the results are (benchmarking utilities are some of the very few Macintosh programs that actually use the FPU, along with high-end CAD, graphics applications, spreadsheets and screensavers like After Dark, seemingly).
Certainly some LCIIIs (25MHz) shipped with a 68030 marked at only 16MHz. The Performa 460 (or LCIII+) is just a speed-bumped LCIII, and I would not be the slightest surprised if everything in it with the exception of the oscillator controlling the speed were not identical to what is in the average LCIII; in general, 68030s seem to be willing to be overclocked fairly generously. In general, the speeds Apple set its hardware at in the early 90s were controlled as much by marketing criteria and the associated profit lines of the company than they were by the hardware's inherent capacity (e.g., a IIsi can run as fast as a IIci, except that it can't because it was deliberately hobbled so as not to compete with the much more expensive IIci).
The 68882 is most likely much the same animal as the 68030, but YMMV. The proof of the pudding will be in the eating.