Intel Core 2 Extreme QX6700 Quad-Core Processor, 2.6 GHz, 8M L2 Cache, LGA775

I paid and extra $3.00 for express shipping. It was ordered on Monday evening and I received it Thursday morning. Packaging was more than expected for a used product. The CPU very clean contained in case, placed in Mylar bag and shipped in bubble bag. Most importantly of all it worked and continues to work great.I have a Dell XPS 700 that I purchased in December of 2006. The original CPU was a Intel E6400 2.13GHz and achieved a respectable Windows Experience Index (WEI) of 5.1. Because the XPS 700 has a NVIDIA N590 chipset, I was able to "overclock" (OC) the E6400 to 2.66 GHz by flashing the BIOS to 1.4. and using the "N-Tune" utility from NVIDIA's website. The E6400 with the OC now has a WEI of 5.3. Note that N-Tune is an operating system (OS) utility and some games act abnormal in this mode. Examples are over talking or acting like they are on massive steroids. A nice work around is to use the command line "bcdedit /set useplatformclock TRUE". This will give the overclock benefit and cause the game programs to behave.The XPS has (x2) GTX 550ti video cards. One is a PNY XLR8 and the other MSI Cyclone-II. The game bottleneck, even with the OC is the CPU, which is why I decided to upgrade.In my research, I discovered that I could add a quad CPU up to a QX6800. It was an obscure statement on one of Dell's forums that went something like, unlike other XPS motherboards (MB), the H2C does NOT support the following…. and a list of CPUs followed. One enterprising user took a leap of faith and decided that the Dell tech meant that the XPS 700 would support the CPUs in the list and plopped one in and it worked. So, I decided to try.I didn't go with the QX6800 because it was $200 (used) and I didn't want to spend that much on something that might not work. I decided to go with the QX6700. I figured I could overclock it to the 6800 speed.I was fortunate to keep my user manuals, which went into great detail on how to replace the CPU. In addition, there are many instructions, comments, experiences, on the internet on how to replace a CPU. I knew what products to get, what products not to get and how to precisely to remove, clean, and exchange a CPU on any MB ever produced; it's just amazing the amount of material. Because of this, swapping out the CPU was brilliantly easy. The longest amount of time was cleaning my old case of 5 1/2 years of dust.I had already uninstalled the nTune utility because I had no idea what that would do with the new CPU. I turned on the computer and got caught off guard because the BIOS was squawking about the CPU, windows had booted. I had to go back and reboot to get into the BIOS. I had read that a multiplier parameter would appear in the BIOS when an "X" chip was installed in the motherboard and sure enough the multiplier was there. I immediately upped the clock to 2.92 GHz. The system worked perfect. No BSOD, lockups or instability.I then increased the CPU speed to 3.2 GHz and again system worked great. The issue I have with this speed is the core temp increased to 72º at 100%. Now, core temp says the Tj. Max is 85º. I also read that 64.5º was the max temp I should be running this processor. So, I wanted to get the core temperature down. The CPU fan was not at max speed so I installed nTune to see if I could increase the CPU cooler fan. I thought I would be able to control the MB fans, which is an option in nTune, and not adjust CPU frequency. This was not the case. The computer did not like nTune. After several BSODs and lock ups, I uninstalled nTune and throttled back the CPU to 2.92. At this frequency and voltage the core rarely goes above 60º and my "real-world" applications are really not affected. In other words I didn't take a performance hit by lowering the CPU frequency to 2.92 GHz.

This Cpu is great i got it a day before it was suppose to get here and it works great. If i ever have another motherboard of this type i would buy again.

This is the first processor I've ever bought, to upgrade an old Optiplex 755 I got for free. I'm new to computer modifications so I unless I'm missing something here, $33 for a 64-bit quad-core @2.6GHz seems very awesome. The computer is around ten years old and is now more powerful than many new computers. I can't upgrade further, which is why I chose this processor for it. It works perfectly fine and fast with no problems.

It is a rather good processor however , It does run a little on the hot side if you are using a stock Fan do yourself a favor and buy a Aftermarket Heat sink.The New I7 are much better however I purchased this item used and it works fine and literally begs to be overclocked.For Video editing purposes this gets 4 stars however for gaming purposes 3 and a half as it relates to nowadays games of course.

The Intel QX6700 is a very powerful and versatile CPU with Quad Core Design, 8MB L2 Cache and an Unlocked Multiplier which allows the PC Power user and tinkerers to over clock or under clock the CPU by changing the multiplier and/or FSB.On my computer, I have a Gigabyte GA-P965-DS3 Motherboard (Version 1.0, Bios Version 13). With Intel's 965 chipset The Bios gives me a choice of multipliers for the QX6700 ranging from 6x to 16x. I have tested almost the entire range of multipliers and found through trial and error that the maximum usable range is between 6x and 11x with my current hardware configuration. outside the range of multipliers I specified above , my PC will either fail to boot, fail to load the OS (Windows XP) or fail to run applications in Windows causing the PC to reboot spontaneously, often without warning.I have found my 'happy medium' configuration on my PC to be: OC the FSB from 266 MHz to: 333MHz, OC Memory from 800MHz to 833 MHz, CPU Bus speed multiplier:10x results in CPU Core OC from 2.66 GHz to:3.33.GHz; With these settings, my PC is about 95% stable, and never overheats as long as I clean the Case Air Filter, Fans and Heatsinks Monthly.Note: The CPU Cooler I am using is a ThermalRight brand, Air Cooled unit with 8 Copper Heat Pipes transferring heat from the CPU to a 120mm W x 110mm H x 79mm D Aluminum Heatsink cooled with a 92mm SCYTHE KAMA PWM controlled variable speed fan rated at 200 RPM - 2500 RPM, 0 CFM - 55.55 CFM; Thermal Compound I used between the CPU and the CPU Cooler is: Arctic Silver 5 Thermal Compound; I highly recommend the use of Arctic Silver 5 Thermal compound for any heat sink application.I am very happy with the Intel QX6700 Extreme Quad Core CPU I installed in my PC.

A good upgrade to an aging intel duo core 5300, but may require a better cooling solution than stock. You might be better yet served with the q9650 processor as the cooling requirements are lower and as it has more cache and higher speed.

Bought this CPU for a gaming computer build, and was not disappointed at all. It was by far the easiest thing to install on my computer, even came with the thermal paste! I read multiple articles on this CPU, and I found that there are many people who feel that this is one of the most cost efficient for the motherboard, which I completely agree. My tip to anyone who is building a computer and considering this Core: make sure that you buy RAM that is compatible with the motherboard :)

Great processor, even with its current age. Paired with an RX460, actually makes for a super cheap mid-range gaming pc. I've got it sitting under a cooler master hyper 212 Evo, and as cliché as that may be, it works fantastic.