Differences between R4 & R4SDHC & memory cards

Can someone please clarify for me the differences between R4 & R4SDHC?
I am a very happy R4 user, a novice, I found my way through trial and error & this wonderful site & helpful members - I am now looking to get something like R4 for a friend and seen the SDHC so what are the differences please?
Also I am correct in thinking the R4 works best with up to 2gb memory card & anything larger will slow it down/stop it working? My kids have R4 and 2 memory cards to swap around, is this best?

R4SDHC is compatible with micro sdhc cards witch can be up to 32 gigs the R4 only works with 2 gig micro sd cards

And is the software different for the SDHC?

...From experience, my GUESS is that it's the hardware is different, not the software, since it can be updated, like the acekard 2.1 compared to the i version, one for the normal ds, the other for dsi...But I can be wrong, prehaps it needs a different fireware to run (an older version/hacked/newer)...Anyone know for sure I'm going from acekard experience...

yes, different hardware, but also needs different firmware (because the hardware is different).

Which is best in your opinion? Is it easy to find the 'drivers' to make the SDHC work?

R4SDHC is the only one of the two still available.

SDHC is better, if for no other reason than that the firmware is still being updated. The original R4 cart has not been updated in almost a year, and most likely will never be updated again since the R4 team has disbanded. The original R4 is also not being made anymore, so what you can buy now are all clones. This isn't necessarily bad, as mine is a clone and I've never had any issues with it (aside from compatibility problems due to the aforementioned 'no more updates' issue), but there is some risk involved in buying a clone.I'd recommend that you get a CycloDS or Acekard if you're in the market for something new, though. The Cyclo is a better product, but more expensive. The Acecard is good, though, and comparable in price to an R4.

I have an R4 SDHC and it works great. I only have a 2 gig micro SD in it at the now but I plan on getting a larger capacity card for it someday.Yes, like Loonylion said, it does take different firmware. v1.25 is what I use in mine and my wife's.In my opinion it the R4 SDHC works just as good as the R4 but I have only tried it with a 2gig Micro SD card so far.

i have a 8 gig and it runs pretty good.

pug: Supposedly some of the original team are on the Hyper R4i team.

Just Googled it, looks pretty awesome! I don't have a DSI yet though.

anandjones · #11pug: Supposedly some of the original team are on the Hyper R4i team.

Really? I just checked out their website, and they say that it's available through Divineo in North America. Can't seem to find it, and I've never had any luck on that site, anyway. It's a poor layout. I'll keep my eyes open for it to hit my usual resellers and for some reviews.Thanks for the heads up!

From Ishopvideogame's blog:

Last Friday we introduced you a new R4 flashcard - Hyper R4i, with a quite big name: the real successor of R4 team. To get through this renowned visitor, we own the card and like to share what is the truth hidden behind it.The KernelDownload the latest kernel ver 1.54, unzip the rar, open the _DS_MENU.DAT with Flex HEX (any HEX Editor is ok), then search for the key word “akmenu4.nds”. What will you find? All things turn to be clear. There should be something more to declare the fact, check the DLDI which is just a copy of R4 DS Pro. That’s the developer’s little tricks.The Dual KernelIt’s ordinary to add a name “Dual kernel” to Hyper R4i since Ak has already own its tech about duo core. You can simply choose from new engine and old one when booting a game by pressing lightly or holding A button. AKAIO is also available on Hyper R4i, but only AKAIO 1.4.1 + 20090403 AK2 Loader due to the anti-fake program added into the latest AKAIO loader to exile the clone cards.The limitationOnething we find out about the card is that you can not activate the game cheat even you’ve keyed in the correct code for the certain game, because you can not open the cheat menu at all. And the imitative R4 GUI is really unsightly, further more, the ordinary R4 skin is not compatible with Hyper R4i. That’s all it is.

Seems like yet another cheap knock-off. Shame.