New iMacs Ethernet (NIC) Jumbo Frames?

Discussion in 'iMac' started by urbanmacUser, Jul 29, 2010.

  1. urbanmacUser macrumors regular


    Sep 9, 2008
    The October 2009 iMacs Ethernet controller did not support Jumbo Frames :mad:

    Anyone know if the Ethernet controller in the new mid 2010 iMac has been upgraded?

  2. pudrums macrumors 6502a

    Feb 24, 2009
    The i7 iMac is perfect for me if it finally supports Jumbo Frames!
  3. Mr-Stabby macrumors 6502

    Sep 1, 2004
    I thought all recent Macs did support Jumbo Frames? I have many iMacs ranging from White core duo machines all the way to the 2009 27 inch model running jumbo frames on our college network. Even our core duo mac minis support it. The only iMacs we've still got that don't support it are the G5 iMacs.
  4. pudrums macrumors 6502a

    Feb 24, 2009
    The 2009 i5/i7 iMacs don't support Jumbo Frames, only the C2D models do due to different Ethernet controllers so it would be interesting to know if any of the new models support them.
  5. Mr-Stabby macrumors 6502

    Sep 1, 2004
    Oh that is ridiculous. So the lower models support it but the upper models don't? And a feature which is available in a 2006 base model Mac MINI is not available in a top of the range 2010 iMac? What are Apple playing at?!

    This could cause us a major problem. Our college relies on Jumbo Frames and we've just ordered 20 new base model i3 iMacs. It didn't even occur to me that Apple would be as stupid as to drop such a basic feature from their network cards.

    In that case, i'm now as eager to find out the answer to this as the OP is.
  6. Sun Baked macrumors G5

    Sun Baked

    May 19, 2002
    Just pull up the hardware config in About this Mac to see if it is using the same Ethernet chip.
  7. pudrums macrumors 6502a

    Feb 24, 2009
    @Mr-Stabby: 21 or 27 inches? If 27 please check Jumbo Frames Support and post your findings if possible. Hopefully a user of the new i7 shows up here soon to give us answers.
  8. Mr-Stabby macrumors 6502

    Sep 1, 2004
    We've ordered the base model 21.5 inch i3. Though if they still do lack jumbo frames support, i am going to have to send them back. That is a deal breaker for us. Utterly stupid. The new Mac Minis support it, but that's probably because they are still Core2Duo. The (late 2009) 27 inch iMac models we have which are Core2Duo support it.

    I'm sure someone else will come back with an answer before i do, but if our machines turn up before anyone elses, i'll be sure to let you know.
  9. icharry macrumors member

    Jun 23, 2009
    I asked Rob at barefeats to test this very issue...

    I asked Rob at barefeats to test this very issue... Also Walter on the

    Seriously this would be a HUGE letdown - Jumbo makes up for lack of USB3 / esata...

    Fingers crossed.
  10. Mr-Stabby macrumors 6502

    Sep 1, 2004
    The network card chip on the new Mac Mini which does support jumbo frames also handles the SDXC reader which is interesting. As the new iMac now has an SDXC slot, i wonder if they've used the same chip. Of course i know sod all about how Macs are built, so i may be completely wrong, but if they do we may be lucky. It at least puts a slight downer on the theory that the only reason the Mac Mini has jumbo frame support is because it's still Core2Duo. It uses a different chip to the other Core2Duo machines.
  11. pudrums macrumors 6502a

    Feb 24, 2009
    Walter = Walter Biscardi? I heard about the problem from him he solved it by getting the 3,33GHz C2D in 2009, but I'd rather like to get the i7 one.
  12. Vylen macrumors 65816

    Jun 3, 2010
    Sydney, Australia
    I don't think it supports Jumbo Frames.

    Just look at the specs on the Apple page - it doesn't say it supports it.

    And before you say "Why would they put it there?" Well, they have for the Mac Mini and Mac Pro.
  13. pudrums macrumors 6502a

    Feb 24, 2009
    Yeah Walter mentioned that too, but I won't give up hope until someone has verified it:D
  14. bolen macrumors 6502


    Jul 22, 2008
    Any news on this? Any iMac 27" 2010 owners that can verify?
  15. Mr-Stabby macrumors 6502

    Sep 1, 2004
    Just bumping this, am really wanting to know if anyone knows the definitive answer to this?

    All i know is i downloaded the 10.6.4 update that was for the 2010 iMacs only, and noticed that it does have drivers for the Intel 82574L Ethernet Controller embedded in it. Odd considering that's the Ethernet controller used on the Mac Pro. I'd understand if it had drivers for other Ethernet chips too, but it doesn't. The normal 10.6.4 update has that same set of drivers, but also has others too. So i can't help but think it's deliberate that the drivers for only that controller were included in the iMac 2010 only update. Might be wrong though. That controller of course does support Jumbo Frames.

    Also, people have noted that the tech specs on the Apple website don't mention that the ethernet port supports jumbo frames on the new iMacs, yet the tech specs on the Mac Mini and the Mac Pro do. Oddly enough the tech spec pages for all the iMacs going back to 2006 neglect to mention the fact that the ethernet port supports Jumbo Frames, yet they did.

    Any new iMac owners fancy going to the Apple System Profiler and telling us what Ethernet card is in the new model ? :D
  16. pudrums macrumors 6502a

    Feb 24, 2009
    I'm hoping to see some Apple Reseller next week, but can't promise. Any 2010 iMac owner in here would be much appreciated!
  17. Weaselboy Moderator


    Staff Member

    Jan 23, 2005
  18. pudrums macrumors 6502a

    Feb 24, 2009
    Damned, I don't think the big i7 will support them then. I guess I'll have to stick with the "old" C2D 27" one.
  19. Rustus Maximus macrumors 6502

    Rustus Maximus

    Jan 15, 2003
    Has anyone had the opportunity to find the answer to this question yet? The ability to do Jumbo Frames, if possible, along with OWC's eSATA solution turns the iMac into quite the little edit station.
  20. pudrums macrumors 6502a

    Feb 24, 2009
    Probably won't make it to a reseller this week sorry, but since even the i3 model doesn't support Jumbo Frames there's very small hope the i7 will.
  21. asap18 macrumors newbie

    Jul 8, 2010
  22. mjohnson1212 macrumors member

    Nov 15, 2007
    My 2010 i7 does not have jumbo as an option in Ethernet MTU settings.
  23. rworne macrumors 6502a

    Jul 23, 2002
    No jumbo frame support on my i7.

    All the iMacs offered now are i3, i5 and i7 models. So no jumbo frames across the entire line now?
  24. pudrums macrumors 6502a

    Feb 24, 2009
  25. Thermonuclear macrumors 6502

    May 23, 2009
    The 2010 3.2 GHz 21.5 inch iMac does not support jumbo frames.

    It does support a custom MTU length, but the upper limit is 1,500 -- the same as the default.

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