How to upgrade my Acer Aspire MC605? And what should I upgrade and how?

StevenGen said:

Sunjay said:

How to upgrade my Acer Aspire MC605? And what should I upgrade and how? 

It depends on the CPU that you have?  MC-605's come with either a i3-3240 or a top of the range i7-3770 LGA 1155 (Socket H2) CPU, if you have the i3-3240 then upgrade it to the i7-3770 which is the top CPU for your desktop. Also, upgrade the RAM to its max 32 GB into its 2x DIMM slots with DDR3-1600MHz SDRAM to get "Dual-channel" and upgrade its 2.5" 1TB 7200rpm spinner SATA-3 6GB/sec to a new SSD 2.5" SATA-3 6gb/sec drive as that will give you at least 100% better read/write performances and also activate the TRIM command in windows for SSD that will make the drive perform much better. If you have a stand alone GeForce® GT 620 graphics card replace that with a new GeForce GTX260 with a GPU Clock: 576 MHz and a Shader Clock: 1242 MHz Memory Clock: 999 MHz 1998 Mbps effective (as the MC-605 has 1 by PCI Express x1 and 1 by PCI Express x16 slots) that can accomodate this new card and will give you about 150% better graphics performance but, you have to upgrade the 200W OEM ATX MC-605's PSU (power supply) to a new 450W ATX. All these upgrades should increase your MC605's performance considerably for older type games to some new games and especially for the latest Win-10 version: 21H1 OS build: 19043.985 if you are prepared to go to this level and budget for these upgrades. 

StevenGen said:

Sunjay said:

How to upgrade my Acer Aspire MC605? And what should I upgrade and how? 

It depends on the CPU that you have?  MC-605's come with either a i3-3240 or a top of the range i7-3770 LGA 1155 (Socket H2) CPU, if you have the i3-3240 then upgrade it to the i7-3770 which is the top CPU for your desktop. Also, upgrade the RAM to its max 32 GB into its 2x DIMM slots with DDR3-1600MHz SDRAM to get "Dual-channel" and upgrade its 2.5" 1TB 7200rpm spinner SATA-3 6GB/sec to a new SSD 2.5" SATA-3 6gb/sec drive as that will give you at least 100% better read/write performances and also activate the TRIM command in windows for SSD that will make the drive perform much better. If you have a stand alone GeForce® GT 620 graphics card replace that with a new GeForce GTX260 with a GPU Clock: 576 MHz and a Shader Clock: 1242 MHz Memory Clock: 999 MHz 1998 Mbps effective (as the MC-605 has 1 by PCI Express x1 and 1 by PCI Express x16 slots) that can accomodate this new card and will give you about 150% better graphics performance but, you have to upgrade the 200W OEM ATX MC-605's PSU (power supply) to a new 450W ATX. All these upgrades should increase your MC605's performance considerably for older type games to some new games and especially for the latest Win-10 version: 21H1 OS build: 19043.985 if you are prepared to go to this level and budget for these upgrades. 

My MC605 has a Intel(R) Pentium(R) CPU G2020 @ 2.90GHz   2.90 GHz processor and a 2GB Installed RAM, how can I upgrade it?

Your OEM  G2020 CPU is also a Socket 1155 (Socket H2) CPU and the same family as the CPU's I've mentioned above, if you want the top of the range CPU then upgrade to the i7-3770 LGA 1155 (Socket H2) that is a 4 core, 8 threads, 3.4GHz to 3.9GHz turbo at 1MB L2 cache and 8MB L3 cache and has 77W TPD which is 98% upgradeable with your G2020 OEM CPU and much much faster! I don't have a service manual for the MC-605 but I've just realised (sorry about misleading you above) that allot of specs of max RAM for the MC-605 is quoted from as high as 32GB to 8GB max, studying it more closely your Aspire MC-605 "TAKES 8GB MAX RAM" Non-ECC DIMM 240pin RAM into its two slots, so you can upgrade both slots with 2x 4GB DDR3-1600MHz ECC DIMM 240pin which is the max type RAM. 

To upgrade these two components and hard drive if you don't know? Then take your computer to a computer technician as you have to take the CPU out and apply paste and resecure the CPU and then take out the old RAM and replaced with the new so does the hard drive with a new SSD. Don't attempt this if you don't know what you are doing.