imac 21.5" only showing 3.75 GB in activity monitor?

sparkie7

macrumors 68020
Original poster
Oct 17, 2008
2,037
106
I have a base 21.5" iMac. It says it has 4GB RAM under "About This Mac". But when you run Activity Monitor it only shows 3.75 GB total. This doesn't happen on my Mac Pro or MBP. Anyone else notice this inconsistency?
 

mrj412

macrumors regular
May 27, 2009
118
25
You have 4Gb installed, however 256Mb of that is being used by the video card.
 

sparkie7

macrumors 68020
Original poster
Oct 17, 2008
2,037
106
I don't believe that is accurate. I have 4GB of RAM in my computer, but it is reported as 3.75GB, and I have a dedicated graphics card.
That's what I thought too. The graphics card SHOULD have its own RAM.

However looking at the Apple site under specs for the 21.5", it does say..

"NVIDIA GeForce 9400M with 256MB of DDR3 SDRAM shared with main memory"

Bummer :rolleyes:
 

TuffLuffJimmy

macrumors G3
Apr 6, 2007
9,000
25
Portland, OR
That's what I thought too. The graphics card SHOULD have its own RAM.

However looking at the Apple site under specs for the 21.5", it does say..

"NVIDIA GeForce 9400M with 256MB of DDR3 SDRAM shared with main memory"

Bummer :rolleyes:
I've had macs with integrated graphics before with Snow Leopard and it did not show RAM like that. I am 99% positive that that's not why the RAM is displayed like that. Especially since I have my integrated graphics card turned off.
 

psabre

macrumors newbie
Dec 8, 2009
6
0
its a bit deceptive if you ask me. 4GB RAM, should be full 4GB accessible and usable RAM. Otherwise the machine really should be advertised as "comes with 3.75GB RAM"
 

powerbook911

macrumors 68040
Mar 15, 2005
3,735
159
I have confirmed the following:

My imac with OWN graphics card, shows my full amount of memory in activity monitor.

My Mac Mini with NVIDIA 9400 shows in Actvity monitor my memory except .25 GB, which is obviously to graphics.

So yes, that is why activity monitor shows .25 less than you actually have. There are no worries then, it's just functioning as it should.
 

Similar threads

  • gibelma
0
Replies
0
Views
37
  • VJNeumann
4
Replies
4
Views
216
  • AlexGraphicD
9
Replies
9
Views
271
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.