Your choices are limited to what Apple has used as well as what your system is able to support. So lets look at what Apple offered within your models series: [https://everymac.com/ultimate-mac-lookup/?search_keywords=iMac11,2|iMac11,2] these are generally the best one can do.
Now lets take a deep dive into the discreet specs of your systems CPU: [https://ark.intel.com/products/46473/Intel-Core-i3-540-Processor-4M-Cache-3_06-GHz|Intel I3-540 - 3.06 GHz (Clarkdale)]. Here we can see the TDP of the chip '''73 W''' and the socket '''FCLGA1156''' so any other CPU would need to also offer these. If we look at the [https://ark.intel.com/products/codename/29890/Clarkdale|Clarkdale CPU’s] we see Intel never offered an i7 version. The best it offered was this chip [https://ark.intel.com/products/48504/Intel-Core-i5-680-Processor-4M-Cache-3_60-GHz|Intel I5-680 - 3.60 GHz (Clarkdale)] which looking at our listing of Macs is the top one in the iMac11.2 series.
So lets jump up the the next Intel CPU’s Apple used in the 2011 system series: [https://everymac.com/ultimate-mac-lookup/?search_keywords=iMac12,1|iMac12,1] - Sandy Bridge CPU’s. Heres the best this series offered: [https://ark.intel.com/products/52215/Intel-Core-i7-2600S-Processor-8M-Cache-up-to-3_80-GHz|Intel I7-2600S - 3.80 GHz (Sandy Bridge)] as we can see the TDP is 65 W and the socket is '''LGA1155''' so it won’t work in your system.
So best you can use is: [https://ark.intel.com/products/48504/Intel-Core-i5-680-Processor-4M-Cache-3_60-GHz|Intel I5-680 - 3.60 GHz (Clarkdale)] which your system can support.
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Moving on to the GPU: The best this series offered was the ATI Radeon HD 5670 (512 MB) Apple P/N 661-5546 GPU board. The systems size limited the cooling unit so you really can’t go with a more powerful GPU board without cooking your system.
Your choices are limited to what Apple has used as well as what your system is able to support. So lets look at what Apple offered within your model [https://everymac.com/ultimate-mac-lookup/?search_keywords=iMac11,2|iMac11,2] these are generally the best one can do.
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Your choices are limited to what Apple has used as well as what your system is able to support. So lets look at what Apple offered within your models series: [https://everymac.com/ultimate-mac-lookup/?search_keywords=iMac11,2|iMac11,2] these are generally the best one can do.
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Lets take a deep dive into the discreet specs of your systems CPU: [https://ark.intel.com/products/46473/Intel-Core-i3-540-Processor-4M-Cache-3_06-GHz|Intel I3-540 - 3.06 GHz (Clarkdale)] Here we can see the TDP of the chip '''73 W''' and the socket '''FCLGA1156''' so anything other CPU would need to also offer these. If we look at the [https://ark.intel.com/products/codename/29890/Clarkdale|Clarkdale CPU’s] we see Intel never offered an i7 version. The best it offered was this chip [https://ark.intel.com/products/48504/Intel-Core-i5-680-Processor-4M-Cache-3_60-GHz|Intel I5-680 - 3.60 GHz (Clarkdale)] which looking at our listing of Macs is the top one.
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Now lets take a deep dive into the discreet specs of your systems CPU: [https://ark.intel.com/products/46473/Intel-Core-i3-540-Processor-4M-Cache-3_06-GHz|Intel I3-540 - 3.06 GHz (Clarkdale)]. Here we can see the TDP of the chip '''73 W''' and the socket '''FCLGA1156''' so any other CPU would need to also offer these. If we look at the [https://ark.intel.com/products/codename/29890/Clarkdale|Clarkdale CPU’s] we see Intel never offered an i7 version. The best it offered was this chip [https://ark.intel.com/products/48504/Intel-Core-i5-680-Processor-4M-Cache-3_60-GHz|Intel I5-680 - 3.60 GHz (Clarkdale)] which looking at our listing of Macs is the top one in the iMac11.2 series.
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So lets jump up the the next Intel CPU’s Apple used in the 2011 systems [https://everymac.com/ultimate-mac-lookup/?search_keywords=iMac12,1|iMac12,1] - Sandy Bridge CPU’s. Heres the best this series offered: [https://ark.intel.com/products/52215/Intel-Core-i7-2600S-Processor-8M-Cache-up-to-3_80-GHz|Intel I7-2600S - 3.80 GHz (Sandy Bridge)] as we can see the TDP is 65 W and the socket is '''LGA1155''' so it won’t work in your system.
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So lets jump up the the next Intel CPU’s Apple used in the 2011 system series: [https://everymac.com/ultimate-mac-lookup/?search_keywords=iMac12,1|iMac12,1] - Sandy Bridge CPU’s. Heres the best this series offered: [https://ark.intel.com/products/52215/Intel-Core-i7-2600S-Processor-8M-Cache-up-to-3_80-GHz|Intel I7-2600S - 3.80 GHz (Sandy Bridge)] as we can see the TDP is 65 W and the socket is '''LGA1155''' so it won’t work in your system.
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So we are stuck using [https://ark.intel.com/products/48504/Intel-Core-i5-680-Processor-4M-Cache-3_60-GHz|Intel I5-680 - 3.60 GHz (Clarkdale)] as the best your system can support.
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So best you can use is: [https://ark.intel.com/products/48504/Intel-Core-i5-680-Processor-4M-Cache-3_60-GHz|Intel I5-680 - 3.60 GHz (Clarkdale)] which your system can support.
Your choices are limited to what Apple has used as well as what your system is able to support. So lets look at what Apple offered within your model [https://everymac.com/ultimate-mac-lookup/?search_keywords=iMac11,2|iMac11,2] these are generally the best one can do.
Lets take a deep dive into the discreet specs of your systems CPU: [https://ark.intel.com/products/46473/Intel-Core-i3-540-Processor-4M-Cache-3_06-GHz|Intel I3-540 - 3.06 GHz (Clarkdale)] Here we can see the TDP of the chip '''73 W''' and the socket '''FCLGA1156''' so anything other CPU would need to also offer these. If we look at the [https://ark.intel.com/products/codename/29890/Clarkdale|Clarkdale CPU’s] we see Intel never offered an i7 version. The best it offered was this chip [https://ark.intel.com/products/48504/Intel-Core-i5-680-Processor-4M-Cache-3_60-GHz|Intel I5-680 - 3.60 GHz (Clarkdale)] which looking at our listing of Macs is the top one.
So lets jump up the the next Intel CPU’s Apple used in the 2011 systems [https://everymac.com/ultimate-mac-lookup/?search_keywords=iMac12,1|iMac12,1] - Sandy Bridge CPU’s. Heres the best this series offered: [https://ark.intel.com/products/52215/Intel-Core-i7-2600S-Processor-8M-Cache-up-to-3_80-GHz|Intel I7-2600S - 3.80 GHz (Sandy Bridge)] as we can see the TDP is 65 W and the socket is '''LGA1155''' so it won’t work in your system.
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So we are stuck using [https://ark.intel.com/products/48504/Intel-Core-i5-680-Processor-4M-Cache-3_60-GHz|Intel I5-680 - 3.60 GHz (Clarkdale)]
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So we are stuck using [https://ark.intel.com/products/48504/Intel-Core-i5-680-Processor-4M-Cache-3_60-GHz|Intel I5-680 - 3.60 GHz (Clarkdale)] as the best your system can support.
Your choices are limited to what Apple has used as well as what your system is able to support. So lets look at what Apple offered within your model [https://everymac.com/ultimate-mac-lookup/?search_keywords=iMac11,2|iMac11,2] these are generally the best one can do.
Lets take a deep dive into the discreet specs of your systems CPU: [https://ark.intel.com/products/46473/Intel-Core-i3-540-Processor-4M-Cache-3_06-GHz|Intel I3-540 - 3.06 GHz (Clarkdale)] Here we can see the TDP of the chip '''73 W''' and the socket '''FCLGA1156''' so anything other CPU would need to also offer these. If we look at the [https://ark.intel.com/products/codename/29890/Clarkdale|Clarkdale CPU’s] we see Intel never offered an i7 version. The best it offered was this chip [https://ark.intel.com/products/48504/Intel-Core-i5-680-Processor-4M-Cache-3_60-GHz|Intel I5-680 - 3.60 GHz (Clarkdale)] which looking at our listing of Macs is the top one.
So lets jump up the the next Intel CPU’s Apple used in the 2011 systems [https://everymac.com/ultimate-mac-lookup/?search_keywords=iMac12,1|iMac12,1] - Sandy Bridge CPU’s. Heres the best this series offered: [https://ark.intel.com/products/52215/Intel-Core-i7-2600S-Processor-8M-Cache-up-to-3_80-GHz|Intel I7-2600S - 3.80 GHz (Sandy Bridge)] as we can see the TDP is 65 W and the socket is '''LGA1155''' so it won’t work in your system.
So we are stuck using [https://ark.intel.com/products/48504/Intel-Core-i5-680-Processor-4M-Cache-3_60-GHz|Intel I5-680 - 3.60 GHz (Clarkdale)]