Which affects speed more? Processor or RAM?

[Tenacious]

A great deal depends upon which Amiga you're talking about!

68000 (16-bit data bus) Amigas (1000, 500, 600) perform noticeably better with TRUE (still 16-bit) fast ram.  Adding a 32-bit processor (68020, 68030, 68040,68060) alone is a mere modest boost.  A 32-bit accelerator with 32-bit fast ram gives a large boost in performance.

Everything depends on which Amiga and how far you ultimately intend to expand it.

[Tenacious]

Back from dinner.

To complete the thought, 16 bit accelerators are harder to come by today.  The Supra Turbo 28 Mhz was the only one worth anything.  It was very good!

32-bit accelerators for 16-bit amigas are spendy and need 32-bit ram to be useful.

Which Amiga are you talking about?

[Tenacious]

Cammy wrote:

A1200 (2MB Chip, 2MB PCMCIA SRAM)
840 Dhrystones
0.87 MIPS

A1200 (2MB Chip, 8MB FastRAM)
2819 Dhrystones
2.94 MIPS

Some RAM makes the Amiga perform faster, other RAM can slow it down.[/QUOTE]

PCMCIA SRAM is Fast Ram but only 16-bits wide (still great for an un-accelerated A600).  For a performance boost, a 1200 needs 32-bit fast ram, with or without an accelerator.