Intel Core2 Quad Q8400 @ 2.66GHz

Benchmarks for the Intel Core2 Quad Q8400 can be found below. Release dates, price and performance comparisons are also listed when available. This is made using thousands of PerformanceTest benchmark results and is updated daily.

The first graph shows the relative performance of the CPU compared to the 10 other common (single) CPUs in terms of PassMark CPU Mark.
The 2nd graph shows the value for money, in terms of the CPUMark per dollar.
The pricing history data shows the price for a single Processor. For multiple Processors, multiply the price shown by the number of CPUs.

Is the Intel Core2 Quad Q8400 @ 2.66GHz Good for Gaming?

This is a fairly old CPU that is no longer competitive with newer CPUs. [More ...]

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Intel Core2 Quad Q8400 @ 2.66GHz

Description:

Class: Desktop

Socket: LGA775

Clockspeed: 2.7 GHz

Cores: 4 Threads: 4

Typical TDP: 95 W

Cache per CPU Package:
L1 Instruction Cache: 4 x 32 KB
L1 Data Cache: 4 x 32 KB
L2 Cache: 2 x 2048 KB

Other names: Intel(R) Core(TM)2 Quad CPU Q8400 @ 2.66GHz, Intel(R) Core(TM)2 Quad CPU Q8400 @ 2.66GHz, Intel Core2 Quad CPU Q8400 @ 2.66GHz

CPU First Seen on Charts: Q2 2009

CPUmark/$Price: 16.20

Overall Rank:
3781st fastest in multithreading out of 6046 CPUs
3667th fastest in single threading out of 6046 CPUs
1032nd fastest in out of 1595 Desktop CPUs

Last Price Change: $128.88 USD (2021-01-23)

Average CPU Mark rating

Multithread Rating

2087

Single Thread Rating

1142

Samples: 1694*
*Margin for error: Low

PerformanceTest V9
CPU Mark: 3,007
Thread: 1,101

CPU Test Suite Average Results for Intel Core2 Quad Q8400 @ 2.66GHz

Integer Math	9,958 MOps/Sec
Floating Point Math	5,627 MOps/Sec
Find Prime Numbers	7 Million Primes/Sec
Random String Sorting	6,057 Thousand Strings/Sec
Data Encryption	556.9 MBytes/Sec
Data Compression	46,178 KBytes/Sec
Physics	148 Frames/Sec
Extended Instructions	822 Million Matrices/Sec
Single Thread	1,142 MOps/Sec

From submitted results to PerformanceTest V10 as of 10th of October 2026.

CPU Mark Distribution for Intel Core2 Quad Q8400 @ 2.66GHz

Submitted Baseline Distribution Graph as of 8th of October 2026

From submitted results since PerformanceTest V10 as of 8th of October 2026.
For distribution graph only: Results are trimmed to exclude outliers by disregarding the bottom 1% and top 1% of submissions.

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CPU Mark Relative to Top 10 Common Desktop CPUs
As of 10th of October 2026 - Higher results represent better performance
Processor	Average CPU Mark
Intel Core i9-14900K		58,188
Intel Core i9-13900K		58,051
AMD Ryzen 7 7800X3D		34,287
Apple M4 10 Core		23,568
AMD Ryzen 5 5600X		21,820
Intel Core i5-12400F		19,536
Intel Core i9-9900K @ 3.60GHz		18,023
AMD Ryzen 5 3600		17,648
Apple M2 8 Core 3500 MHz		15,648
Apple M1 8 Core 3200 MHz		14,119
Intel Core2 Quad Q8400 @ 2.66GHz		2,087

CPU Value (CPU Mark / $Price )
As of 10th of October 2026 - Higher results represent better value
Processor	CPU Mark / $Price
AMD Ryzen 5 3600		174.80
AMD Ryzen 5 5600X		145.48
Intel Core i9-14900K		126.77
Intel Core i5-12400F		122.18
AMD Ryzen 7 7800X3D		107.15
Intel Core i9-13900K		95.77
Intel Core i9-9900K @ 3.60GHz		81.92
Intel Core2 Quad Q8400 @ 2.66GHz		16.20
Apple M1 8 Core 3200 MHz		NA
Apple M2 8 Core 3500 MHz		NA
Apple M4 10 Core		NA

Single Thread Rating
As of 10th of October 2026 - Higher results represent better performance
Processor	Average Thread Rating
Intel Core i9-14900K		4,690
Intel Core i9-13900K		4,595
Apple M4 10 Core		4,491
Apple M2 8 Core 3500 MHz		3,881
AMD Ryzen 7 7800X3D		3,761
Apple M1 8 Core 3200 MHz		3,672
Intel Core i5-12400F		3,485
AMD Ryzen 5 5600X		3,366
Intel Core i9-9900K @ 3.60GHz		2,908
AMD Ryzen 5 3600		2,557
Intel Core2 Quad Q8400 @ 2.66GHz		1,142

Last 5 Baselines for Intel Core2 Quad Q8400 @ 2.66GHz
Most recent listed first
Baseline	CPU Mark
BL3745664 - Sep 28 2026		2328
BL3713491 - Sep 13 2026		2006
BL3707202 - Sep 10 2026		1914
BL3707163 - Sep 10 2026		1870
BL3680290 - Aug 28 2026		2247

Additional baselines can be obtained using Windows version of PerformanceTest's Manage Baselines feature.

Popular comparisons for Intel Core2 Quad Q8400 @ 2.66GHz
As of 10th of October 2026 - Higher results represent better performance
Processor	Average CPU Mark
Intel Core2 Quad Q8400 @ 2.66GHz		2,087
Intel Core2 Quad Q6700 @ 2.66GHz vs Intel Core2 Quad Q8400		2,092 (+0.2%)
AMD Phenom II X4 910 vs Intel Core2 Quad Q8400		1,840 (-11.9%)
AMD Phenom 9850 Quad-Core vs Intel Core2 Quad Q8400		1,723 (-17.5%)
Intel Core i3-2120 @ 3.30GHz vs Intel Core2 Quad Q8400		1,972 (-5.5%)
AMD Athlon II X3 435 vs Intel Core2 Quad Q8400		1,645 (-21.2%)
Intel Core i3-550 @ 3.20GHz vs Intel Core2 Quad Q8400		1,629 (-22.0%)
AMD Phenom II X4 955 vs Intel Core2 Quad Q8400		2,564 (+22.8%)
Intel Core2 Quad Q9650 @ 3.00GHz vs Intel Core2 Quad Q8400		2,519 (+20.7%)
AMD Athlon II X4 651 Quad-Core vs Intel Core2 Quad Q8400		2,433 (+16.6%)
AMD Phenom II X4 945 vs Intel Core2 Quad Q8400		2,421 (+16.0%)
Intel Core i5-660 @ 3.33GHz vs Intel Core2 Quad Q8400		2,355 (+12.8%)
AMD A6-3650 APU vs Intel Core2 Quad Q8400		2,088 (+0.0%)

Is the Intel Core2 Quad Q8400 @ 2.66GHz Good for Gaming?
As of 10th of October 2026 - Higher results represent better performance
Processor	Relative Gaming Score
AMD Ryzen 9 9950X3D2		15,467
AMD Ryzen 7 9850X3D		12,519
AMD Ryzen 9 9900X3D		12,384
AMD Ryzen 7 9800X3D		12,102
AMD Ryzen 7 PRO 9755X3D		12,028
AMD Ryzen 9 9950X3D		11,258
Intel Core Ultra 7 270K Plus		10,686
AMD Ryzen 5 7600X3D		10,512
Intel Core Ultra 5 250K Plus		10,486
AMD Ryzen 9 7900X3D		10,378
Intel Core Ultra 9 285K		10,354
AMD Ryzen 5 7500X3D		10,058
Intel Core2 Quad Q8400 @ 2.66GHz		155

CPU Benchmarks

CPU Benchmarks

Intel Core2 Quad Q8400 @ 2.66GHz

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CPU Test Suite Average Results for Intel Core2 Quad Q8400 @ 2.66GHz

CPU Mark Distribution for Intel Core2 Quad Q8400 @ 2.66GHz