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Intel Core 2 Quad Q8400 Processor 2.66 GHz 4 MB Cache Socket LGA775

4.5 out of 5 stars 28 customer reviews
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  • CPU Series: Core2 Quad.
  • CPU Model: Q8400.
  • Core Technology: Quad Core.
  • Frequency: 2.66 GHz.
2 new from $169.99 6 used from $21.00 1 refurbished from $39.99

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Product Description

Product Description

Intel Core 2 Quad Processor Q8400 2.66GHz 1333MHz 4MB LGA775 CPU, Retail

From the Manufacturer

The Intel Core 2 Quad Q8400 brings four computing cores running at 2.66 GHz in a single processor for the ultimate in efficiency and performance. It features 4 MB of L2 cache and a 1333 MHz front side bus, and it uses the LGA775 socket for wide compatibility with motherboards. The processor features Intel's 45nm architecture and delivers multimedia experiences with greater speed and responsiveness. With the Q8400, demanding users can now accomplish more in less time.



With four cores, you'll experience outstanding performance and better efficiency.


The Core 2 Quad Q8400 lets you enjoy a smooth and high-quality multimedia experience.


Intel's Intelligent Power Capability ensures optimal energy efficiency.
Intel Core 2 Quad Q8400 Processor features:

  • Four computing cores running at 2.66 GHz.
  • 4 MB of L2 cache.
  • 1333 MHz front side bus.
  • Multimedia acceleration for editing HD video without hiccups.


Stunning Performance Runs Latest Software with Ease
Starting with Intel's revolutionary new high-efficiency, high-performance 45nm processor technology, Intel engineers decided to go one step farther in the performance department. By including 4 MB of shared L2 cache and a front side bus speed of 1333 MHz, the Q8400 processor pushes the technological innovation envelope farther than ever before.

For users, this means the latest and most advanced software applications can open and run faster with superior responsiveness. When used with the latest multimedia software and next-generation games, dropped frames, long waiting times, and stuttering performance are things of the past.

New Technologies Provide Higher Performance and Better Energy Efficiency
By using hafnium, a naturally occurring element, Intel engineers were able to shrink the size of new Intel processors and pack more computing technology into less space. The processor also features Intel's Intelligent Power Capability, which allows it to turn off parts of itself when it isn't in use. The result is improved performance with less energy wastage and a reduction of heat and noise.

Intel has packed the Core 2 Quad Q8400 with cutting-edge technologies for better performance. Wide Dynamic Execution allows the processor to do more tasks simultaneously by enabling the delivery of more instructions per clock cycle. Intel's Advanced Smart Cache technology improves performance by physically placing data closer to the processing cores. And Smart Memory Access, which increases available data bandwidth, means you'll experience less slowdown while multi-tasking, so you can get more done.

Multimedia Acceleration for Faster Content Creation
If you are editing HD video, manipulating professional-grade photos, or working with music, the Q8400 will let your computer keep up with your imagination. The processor features Intel's Advanced Digital Media Boost for accelerating performance of a wide range of applications including video, gaming, speech and image, and photo processing among others. Additionally, Intel's HD Boost technology further improves the performance of SSE4-optimized applications, such as video editing and encoding in high definition.

Fewer Multi-tasking Slowdowns
With four processing cores, you'll be able to juggle more projects and more applications without experiencing the slowdown that you typically see with traditional single-core processors. Processing tasks are split up and distributed to the four different cores so the Q8400 doesn't get bogged down.

Get a Leg Up on the Latest Games
Next-generation gaming is more than just pretty environments and smooth motion. Behind the incredible visual realism of waterfalls or the unlucky ricochet of a bullet are intense, high-speed calculations of asset streaming, terrain generation, 3D rendering, and physics effects. When running select next-generation games, each of the cores in the Q8400 can be dedicated to each of these individual processes, resulting in smoother, more lifelike graphics and further blurring the line between virtual and reality.



Product Information

Product Dimensions 5.7 x 5.2 x 3.2 inches
Item Weight 13.6 ounces
Shipping Weight 12.8 ounces
ASIN B002654FQM
Item model number BX80580Q8400
Customer Reviews
4.5 out of 5 stars 28 customer reviews

4.5 out of 5 stars
Best Sellers Rank #425 in Electronics > Computers & Accessories > Computer Components > CPU Processors
Date first available at Amazon.com September 14, 2004

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Customer Reviews

Top Customer Reviews

By Mike Goble on May 21, 2009
OK, be realistic. This thing smokes! i am running windows 7 64bit, and this thing sits at about 4% usage at all times. i have peaked at 50% at times like when im running a game, unzipping a 4+gig file, browsers open, musics playing, virus scans going.. etc.. i know the cache on its low and the 9550 is only 100$ more, but thats a 100$!!! and this processor probably wont be your bottleneck, you'll be buying new ddr3 ram and bla bla bla.. look if your gonna go above the q8400.. then just buy the i7 920 and have the octocore (HT quad). if you want something that gets rediculous benchmarks under 200 bucks... get this one!!
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This is a fantastic processor. Using an Asus P5Q Pro Turbo, I have the Q8400 at a stable 3.6Ghz. I've pushed it up to 4.0Ghz, got windows to open, went online, messed around for about 30 minutes without any problems. But it shut down after about 20 minutes of a Prime95 stress test. I'm willing to bet that if I spent more time messing around with the voltage, I couldv'e easily attained a stable 4.0Ghz overclock. But as it sits right now, I've been at 3.6Ghz since December '09 without any problems. After a 12 hour, 100% load stress test, the temps maxed out at 58 Degrees. I'm using a Xigmatek Dark Knight CPU cooler (Air). So if you're running a stock cooler, you might have problems with the temp if you OC to 3.6Ghz. But even at the stock speed, this processor can easily handle just about anything you throw at it. All in all, its a great CPU. Great for multitasking, gaming, heavy computing or basic computing. If you think the 2.6Ghz is kind of weak.....its not. You'd be surprised at how well this does at stock speed. And if you do OC, you'll probably be very happy with the results.
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Verified Purchase
Its a very fast CPU, and its very cheap.
I used for a gamoind rig, it even runs Crysis.
Very easy to overclock too, i got it stable @3.1ghz
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This is the first time I have bought this specific CPU - I was very impressed with the speed and performance overall. It's a great deal for what you receive for your hard-earned cash. I would buy from the seller again and I will buy more of these on future builds. RH
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Speed wise its not one of the fastest but give it a heavy load an watch the processing power at work. I'm notorious for multi-tasking and is very satisfied with this performance. Sure for $100 more I can upgrade but I would have to upgrade the memory to DDR3. That $100 can buy more DDR2 4Gig chips and you can't tell that much of a difference.This is a solid product. Do your own research. This is only my opinion.
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A Kid's Review on January 30, 2011
Good CPU but keep in mind this thing runs hot (95 watts) and the included heatsink/fan is only O.K. at best. OEM fan is too noisy for me. Plan on replacing it with a quieter more efficient aftermarket unit. Otherwise this thing does what it is supposed to-and fast. Note that if you are upgrading from a Duo to this Quad you'd better give heat removal, case fans and fan noise a thought!
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Verified Purchase
Very pleased, as I took a chance from these and other reviews, that I could buy this 2.66 Ghz, (seems so slow, nowadays; [I've become spoiled by ever faster everything]) and overclock. And does this processor not even mind the extra umphh. Have a Zalman aftermarket cooler, Zalman CNPS9700LED Ultra Quiet Cpu Cooler, and everything appears to stay the same. Next step up, processor wise, was considerably more money than I thought was the value contained within. This is, I believe, an understated and undervalued processor and I recommend to any. I'm running 16 GB (4 x 4GB Corsair 1600 memories, but with this o'clocked to 3.2 and 1600Mhz FSB, they are a natural fit). That's a whole lot of value and speed from such a modestly priced processor and Gigabytes equally modest GA-EP43T-UD3L motherboard (another unappreciated sleeper; perhaps the profit margin is less and they don't tout these for their potential). As of this writing I can not product link for the motherboard, as the item shown is from another company selling through Amazon, now, and incorrectly picture the motherboard/GA-EP43T-UD3L; the true board's specs are DDR3 not the older DDR2 as shown as of 1/11/11 and, also is not a micro atx (the square one) but a full atx board (the rectangular one). Google for correct picture. The two products, motherboard and this processor, (three if including Corsairs' memory) play very well together, albeit only when bumped up in Easytune, Gigabytes on board overclocker, did all the memory allow posting. I am totally pleased with my purchase, however.
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Verified Purchase
Before I bought this amazing processor I had a Core 2 Duo, 2.13 Ghz, which barely did what I wanted it to do, and ever since I installed this one I have had no problem. It runs a little hotter, but it isn't anywhere near overheating. Great processor for the price I paid for it.
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