Ez flash IV sdhc Class differences

Discussion in 'GBA - Flashing Hardware and Software' started by arq, Sep 20, 2015.

  1. arq
    OP

    arq Advanced Member

    Newcomer
    2
    Sep 20, 2015
    Finland
    Waiting for my new Ez Flash IV microsd-version. Currently missing a microsd card to go along with it, so here's a question I'm pondering:

    Does Ez flash IV has any restrictions or positive differences with different sdhc speed classes? Should I buy class 10 card if possible, would it work and would it have any difference between eg. rom loading times?

    The sdhc speed classes are:
    [​IMG] Class 2 - 2 MB/s
    [​IMG] Class 4 - 4 MB/s
    [​IMG] Class 6 - 6 MB/s
    [​IMG] Class 10 - 10 MB/s
    [​IMG] UHS Speed Class 1 (U1) - 10 MB/s
    [​IMG] UHS Speed Class 3 (U3) - 30 MB/s
     
  2. Joe88

    Joe88 [λ]

    Moderator
    13
    Jan 6, 2008
    United States
    class refers to write speed
     
  3. arq
    OP

    arq Advanced Member

    Newcomer
    2
    Sep 20, 2015
    Finland
    Oh, good to know. I somehow thought it would also affect reading speed.

    Nevermind my question then. :)
     
  4. FAST6191

    FAST6191 Techromancer

    pip Reporter
    20
    Nov 21, 2005
    United Kingdom
    Often better write speed does make for better reads by virtue of better hardware being in there, however even when it does the EZ4 in GBA mode is still held back not by SD read speeds/latency but by the PSRAM/NOR write speeds and generally having to go over the GBA hardware (all 16MHz of the ARM7 with 288 KBytes of RAM to play with).
    I did a test the other month and it seems the new SDHC kernels are noticeably slower writing than old ones, I am not sure of the reason at this point (it might be driver related, it might be that they reverted to the older read methods as we did also see an update that boosted speeds once on the original run of EZ4). Video http://gbatemp.net/threads/ez-iv-ke...sion-released-soon.377952/page-7#post-5574925 if you wanted it.
     
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