710 MHz is a obtainable by every Eris with some getting up as high as 806 or higher. You'll need a new kernel to go over the stock 528 MHz though. Just make a nand backup and try out some custom roms. xtrROM (if you use LauncherPro) and xtrSENSE (if you like the sense ui) are both good.
Head over to XDA and check out what's available.
http://forum.xda-developers.com/forumdisplay.php?f=554
Quote:
Originally Posted by smacky
Most ROMs have [setcpu] incorporated into it.
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The author asked people to stop doing that actually. It's still free for XDA members though.