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Kingston 1333 DDR3 running at 667 mhz.

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  • Asus
  • DDR3
  • Kingston
  • Motherboards
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February 4, 2010 11:21:32 PM

I have 4 GB of Kingston Hyper-X 1333 DDR3 (KHX1333C7D3K2/4G) on a MSI P55-CD53 mobo and a Core-i5 cpu. The RAM seems to be a little sluggish so i looked at the MSI Control Center and its running at 667mhz. CPU-Z says the same thing. Why is the speed so slow and what can i do to run it at the 1333mhz i paid for? Oh and its 2x2 GB sticks Dual-Channel.

More about : kingston 1333 ddr3 running 667 mhz

February 5, 2010 12:33:40 AM

welcome to the forum
that's strange, ddr3 1333 should be running at 444mhz, when u see that from cpuz of bios the number is divided by 3 for ddr3 1333/3=444 so 444 should be the speed, if it's ddr2 then it's divided by 2, eg:D dr2 800 should be running at 400mhz if it's ddr then the speed on bios the the speed of ram.
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February 5, 2010 12:40:57 AM

G_Masko said:
I have 4 GB of Kingston Hyper-X 1333 DDR3 (KHX1333C7D3K2/4G) on a MSI P55-CD53 mobo and a Core-i5 cpu. The RAM seems to be a little sluggish so i looked at the MSI Control Center and its running at 667mhz. CPU-Z says the same thing. Why is the speed so slow and what can i do to run it at the 1333mhz i paid for? Oh and its 2x2 GB sticks Dual-Channel.


Go into the Bios and change the RAM frequency to 666 or 667 (depends on motherboard) = 1333Mhz

Make sure you have the correct timings/voltage as well ;) 

I run my ram at 800 = 1600Mhz 6-6-6-18-24-1T 1.90800v
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February 5, 2010 12:58:16 AM

szbxa said:
welcome to the forum
that's strange, ddr3 1333 should be running at 444mhz, when u see that from cpuz of bios the number is divided by 3 for ddr3 1333/3=444 so 444 should be the speed, if it's ddr2 then it's divided by 2, eg:D dr2 800 should be running at 400mhz if it's ddr then the speed on bios the the speed of ram.


Where the hell did you get that? DDR3 1333 runs at 667mhz.

Your mobo might not be able to recognize the RAM SPD settings outright. Check the SPD settings of your RAM and take note of the timings and voltage for 667mhz via CPU-Z then go to BIOS, set the RAM frequency at 667. Make sure that the timings & voltage are quite the same with the SPD profiles.
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February 12, 2010 5:06:09 AM

G_Masko said:
I have 4 GB of Kingston Hyper-X 1333 DDR3 (KHX1333C7D3K2/4G) on a MSI P55-CD53 mobo and a Core-i5 cpu. The RAM seems to be a little sluggish so i looked at the MSI Control Center and its running at 667mhz. CPU-Z says the same thing. Why is the speed so slow and what can i do to run it at the 1333mhz i paid for? Oh and its 2x2 GB sticks Dual-Channel.


Thanks for the replies guys.
From what i understand the ram is fine cause it is dual channel therefore divided in 2.
667 x 2 = 1336.
Im a noob in system/hardware tweaking and dread anytime i have to enter the bios. I feel like every key stroke will ruin the pc. (Hence i call myself a noob:) 
So thanks again for your input.

I also came across something else that im not sure what to make of.
CPU-Z gives the same timings (jedec #1 - #4)on dimm 1 and dimm 3, like it should be, i assume.
But Control Center tells me there is an xmp 1600 at 800mhz after the jedec #4. Thats on both dimms.
Kingston website says my ram doesnt even support xmp profiles!
And dimm 3 doesnt even have a jedec #4 which throws off the timings so dimm 1 and 3 are running different timings, apparently.
Matter of fact CPU-z and MSI are giving me different timings all together!
My question NOW is which do you presume is more reliable the MSI or CPU-Z?
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