can i upgrade from E5700 lga775 45nm to this CPU i do not oc i just want it for speed increase

I'm not 100% sure, but I dont see why not as they're both LGA775 chips.

is this compatible with dell inspiron 530s?

Yes, it is compatible with Dell 530s. However, you might need a different cooling fan for E8600.

what is the fastest processor in the lga 775 socket family. i heard q9550?

The QX9650 was the fastest CPU for the LGA775 family. Almost same specs as the standard Q9650 (without the 'extreme' over-clocking). Both are LGA775 based.

Is this CPU compatible with a Dell Optiplex 745? Currently installed is an Intel(R) Core(TM)2 CPU 6300 @1.86GHz 1.86GHz.

Although I do not know if the system you mentioned supports the CPU, your socket 775 motherboard should accept the CPU. Just one thing to keep in mind; after upgrading to this CPU I experience very serious memory error issues, reinstalled the OS several times and got to the point where I thought tge system was seroiusly and pernanently damaged when I found that I had a bad power supply. Turns out the CPU required more power than my crappy mini ATX supply could handle. Bought a 600 watt one ( which I keep outside the mini ATX case of course) and all problems where resolved. This CPU makes my HT computer feel like a brand new machine. Would highly recommend it, just nake sure your power supply can handle it.

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Core 2 Duo E8600 3.33GHz 6M L2 Cache 1333MHz LGA775 Desktop Processor

Product ID: 12744177

Details

Brand
Intel
CPU Manufacturer
Intel
CPU Socket
LGA 775
CPU Speed
3.33 GHz
Secondary Cache
6 MB

⚡3.33GHz Speed

💾6MB Cache

🔌45W Power

Description

🚀 Power Up Your Performance!

UNLEASH DUAL POWER - Experience seamless multitasking with 2 cores and 2 threads.
EFFICIENT ENERGY USE - Stay eco-friendly with only 45 watts of power consumption.
GENEROUS CACHE MEMORY - Enjoy rapid data access with 6MB of L2 cache.
VERSATILE COMPATIBILITY - Designed for LGA775 socket, perfect for various setups.
LIGHTNING FAST PERFORMANCE - Boost your productivity with a blazing 3.33GHz clock speed.

The Intel Core 2 Duo E8600 is a high-performance desktop processor featuring a 3.33GHz clock speed, 6MB L2 cache, and efficient 45-watt power consumption, making it an ideal choice for multitasking and demanding applications.

Specifications

ASIN	B001BS1ONW
Best Sellers Rank	#841 in Computer CPU Processors
Brand	Intel
Cache Memory Installed Size	6
Customer Reviews	4.6 4.6 out of 5 stars (96)
Global Trade Identification Number	00675900971240
Item Weight	12.8 ounces
Manufacturer	Intel
Mfr Part Number	BX80570E8600
Model Number	BX80570E8600
Number of Items	1
Number of Packs	1
Platform	Not Machine Specific
Processor Brand	Intel
Processor Core Count	2
Processor Count	2
Processor Number of Concurrent Threads	4
Processor Socket	LGA 775
Processor Speed	3.33 GHz
Secondary Cache	6 MB
UPC	735858203067 999992555769 675900971240
Unit Count	1 Count
Wattage	65 watts

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