I bought a single 8Gb stick of this for my build - it says 2400 but is running at 1200. Why? Is it only 2400 if I run 2 sticks?

Modern DRAM modules support double data rate (DDR) transfers, meaning that although they function at a given clock speed, they transfer data during both the rise and fall of a CPU clock cycle, allowing for double the data transfers their native speed, or frequency, would suggest. Some diagnostic or system information software does not express this clearly, only reflecting the modules' frequency in megahertz (MHz), making such feedback suggest that your parts are only running at half their possible speed. For example, DDR3-1600 supports 1600 megatransfers per second (MT/s) due to its nature as DDR memory, but runs at 800 MHz.

What is the difference between crucial ct8g4dfd824a and crucial ct8g4dfs824a?

Thanks for your question. CT8G4DFD824A is a dual ranked part and CT8G4DFS824A is a single ranked part. More information on this can be found here: http://forums.crucial.com/t5/Crucial-memory-for-PC-systems/What-is-a-memory-Rank/ta-p/126346

If I add a 8gb for my Dell i5675 will it be compatible with the 8gb thats already in my pc?

Thank you for contacting Crucial and for your question. The part number that you provided is 100% compatible with your system. That being said, we can guarantee that our memory will work with your computer, but we have no way to guarantee that it will work with what is currently installed in the system. I can tell you that most consumer systems out there can mix different brands of memory without running into any issues.

Crucial 8gb single ddr4 2400 mt/s (pc4-19200) dr x8 unbuffered dimm 288-pin memory - ct8g4dfd824a can it compatible with msi gaming h110?

Yes, CT8G4DFD824A is compatible with the MSI H110M GAMING.

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⚡ Upgrade your workflow — power, speed, and efficiency in one sleek kit!

MASSIVE 32 GB CAPACITY - Double your multitasking power with 16GB x 2 modules.
BLAZING 2666 MT S SPEED - Experience smooth, lag-free performance for demanding apps.
ENERGY EFFICIENT DESIGN - Cut power use by up to 40%, keeping your setup cool and green.
OPTIMIZED FOR NEXT GEN CP US - Seamlessly compatible with the latest processors and platforms.
BOOSTED BANDWIDTH BURST ACCESS - Up to 32% more bandwidth for faster data flow and quicker load times.

The Crucial 32GB DDR4 2666 MT/s UDIMM memory kit (CT2K16G4DFRA266) delivers high-capacity, energy-efficient performance optimized for modern processors. With dual 16GB modules, it enhances multitasking and speeds up data throughput by up to 32%, while reducing power consumption by 40%, making it an essential upgrade for professionals seeking reliable, fast, and efficient memory.

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RAM	32 GB DDR4
Memory Speed	2666 MHz
Brand	Crucial
Series	Crucial Memory
Item model number	CT2K16G4DFRA266
Item Weight	0.5 ounces
Product Dimensions	5.25 x 0.03 x 1.23 inches
Item Dimensions LxWxH	5.25 x 0.03 x 1.23 inches
Color	Multicolor
Number of Processors	1
Computer Memory Type	DDR4 SDRAM
Voltage	1.2 Volts
Manufacturer	Crucial
Language	English, English, English, English, English
ASIN	B08C4VGJL3
Date First Available	July 9, 2020

Crucial 32GB Kit (16GB x 2) DDR4 2666 MT/s (PC4-21300) UDIMM 288-Pin Memory - CT2K16G4DFRA266

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