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My Specs are as follows:

Model Name: iMac Model Identifier: iMac10,1 Processor Name: Intel Core 2 Duo Processor Speed: 3.06 GHz Number Of Processors: 1 Total Number Of Cores: 2 L2 Cache: 3 MB Memory: 4 GB Bus Speed: 1.07 GHz Boot ROM Version: IM101.00CC.B00 SMC Version (system): 1.52f9 Serial Number (system): W8008JEF5PC Hardware UUID: EECDACBD-AF6B-5B3E-B382-2702F2AA64AD

Current RAM: Memory Slots:

ECC: Disabled

BANK 0/DIMM0:

Size: Empty Type: Empty Speed: Empty Status: Empty Manufacturer: Empty Part Number: Empty Serial Number: Empty

BANK 1/DIMM0:

Size: Empty Type: Empty Speed: Empty Status: Empty Manufacturer: Empty Part Number: Empty Serial Number: Empty

BANK 0/DIMM1:

Size: 2 GB Type: DDR3 Speed: 1067 MHz Status: OK Manufacturer: 0x80AD Part Number: 0x484D54313235533642465238432D47372020 Serial Number: 0x108343E7

BANK 1/DIMM1:

Size: 2 GB Type: DDR3 Speed: 1067 MHz Status: OK Manufacturer: 0x80AD Part Number: 0x484D54313235533642465238432D47372020 Serial Number: 0x101343E9

  1. What sort/kind of RAM should I purchase to improve the current RAM capacity?
  2. Should I buy an extra 2 x 2GB RAM or 2 x 4GB?
  3. Which Slot should it be inserted to should I purchase the new RAMs?
  4. Will it have a negative effect on the overall performance?
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3 Answers 3

Getting a performance boost depends on what you actually do with the thing. Run Activity-Monitor (Applications>Utilities) to see how much of your RAM is used. Most Mac stuff runs well on 4GB, but if you run memory intense stuff (Parallels-Windows, Video Editing, editing large pictures with photoshop) you should see an improvement. But even if you don't need the RAM, you should not see a performance penalty (i.e. it may or may not run better, but won't run worse).

Unless your computer is already slowing down to a crawl with the current configuration (when doing memory intense work), adding 2x 2GB should be enough (giving you a total of 8GB).

So, given your configuration, I'd add 2x 2GB to the free slots and keep the memory that is already there in the other slot.

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but if I know manufacturer, what cards should I install? My manufacturer is 0x80AD (Macbook Pro Late 2011) –  gaussblurinc Aug 7 '13 at 12:20

I second Patrix's answer.

As for the overall performance impact, as long as you install the correct type of RAM in duals (meaning 2 sticks of the same type), it should boost your performance.

You need to pay attention to how much RAM your iMac model takes as maximum. You already have 4GB; check if it's possible for you to replace both sticks to 2x4GB for a total of 8GB.

Update based on the comment below:

This article lists the steps necessary to add/change RAM for your iMac model. Your iMac model (Late 2009) contains 4 RAM slots; each slot can hold 4 GB maximum for a total of 16 GB RAM. The RAM type is SO-DIMMs 1066 MHz DDR3 SDRAM. Here is an example from Newegg.com.

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21.5" Screen NVIDIA GeForce 9400: Chipset Model: NVIDIA GeForce 9400 Type: GPU Bus: PCI VRAM (Total): 256 MB Vendor: NVIDIA (0x10de) Device ID: 0x0869 Revision ID: 0x00b1 ROM Revision: 3454 Displays: iMac: Resolution: 1920 x 1080 Pixel Depth: 32-Bit Color (ARGB8888) Main Display: Yes Mirror: Off Online: Yes Built-In: Yes Display Connector: Status: No Display Connected –  user50113 May 27 '13 at 6:56
    
Check the update to my answer above. –  Melwan May 27 '13 at 11:09

Apple has a bunch of support articles on their Support site, just pick the one which applies to your model.

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