F5F Stay Refreshed Power Users Overclocking The Corsair Vengeance Pro 2400Mhz with 2x8GB RAM isn't operating at its maximum speed.

The Corsair Vengeance Pro 2400Mhz with 2x8GB RAM isn't operating at its maximum speed.

The Corsair Vengeance Pro 2400Mhz with 2x8GB RAM isn't operating at its maximum speed.

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HyperMouse
Member
75
05-19-2025, 11:54 PM
#1
Motherboard: Gigabyte Z97X-UD5H 1.0
Processor: Intel® Core™ i5-4670K CPU @ 3.40GHz
RAM: Corsair Vengeance Pro 2400 MHz 2x16Gb (CMY16GX3M2A2400C11R)
According to the specifications, I checked my PC settings and found RAM defaulting at 1200Mhz.
Attempting to increase it via BIOS using XMP profile 1 caused the system to crash during operation.
I tested by leaving XMP profile 1 active, adjusting RAM voltage to 1.65 and CPU core voltage to 1.069V, which allowed RAM to run at its intended 2400MHz (stats available in CPU-Z).
Running Prime95 resulted in one of the four cores crashing after an hour.
Additionally, I looked up RAM compatibility for my motherboard and couldn’t locate my exact model in the listings; CMD16GX3M2A2400C10 and CMD16GX3M2A2400C10R were compatible options, but the 11R variant seemed problematic.
I’m seeking advice on achieving stable overclocking for my RAM to reach its intended speed, as I’m new to this process.
Appreciate your time and assistance.
H
HyperMouse
05-19-2025, 11:54 PM #1

Motherboard: Gigabyte Z97X-UD5H 1.0
Processor: Intel® Core™ i5-4670K CPU @ 3.40GHz
RAM: Corsair Vengeance Pro 2400 MHz 2x16Gb (CMY16GX3M2A2400C11R)
According to the specifications, I checked my PC settings and found RAM defaulting at 1200Mhz.
Attempting to increase it via BIOS using XMP profile 1 caused the system to crash during operation.
I tested by leaving XMP profile 1 active, adjusting RAM voltage to 1.65 and CPU core voltage to 1.069V, which allowed RAM to run at its intended 2400MHz (stats available in CPU-Z).
Running Prime95 resulted in one of the four cores crashing after an hour.
Additionally, I looked up RAM compatibility for my motherboard and couldn’t locate my exact model in the listings; CMD16GX3M2A2400C10 and CMD16GX3M2A2400C10R were compatible options, but the 11R variant seemed problematic.
I’m seeking advice on achieving stable overclocking for my RAM to reach its intended speed, as I’m new to this process.
Appreciate your time and assistance.

M
mrchubb
Junior Member
9
05-19-2025, 11:54 PM
#2
When you push the CPU to its maximum speed, lowering it until no crashes occur on Prime95 shows what happens. Use hwinfo sensor to monitor temperature and core speed.
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mrchubb
05-19-2025, 11:54 PM #2

When you push the CPU to its maximum speed, lowering it until no crashes occur on Prime95 shows what happens. Use hwinfo sensor to monitor temperature and core speed.

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reddwarf1234
Member
219
05-19-2025, 11:54 PM
#3
I don't think DDR3 runs at 1200MHz.
You have to factor the Double Data Rate (DDR).
2x 1200MHz = 2400.
I don't see any attachment.
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reddwarf1234
05-19-2025, 11:54 PM #3

I don't think DDR3 runs at 1200MHz.
You have to factor the Double Data Rate (DDR).
2x 1200MHz = 2400.
I don't see any attachment.

D
Demicha
Junior Member
18
05-19-2025, 11:54 PM
#4
I checked the CPU-Z SPD tab for speed details, JEDEC timings, XMP settings, voltages, and memory information. The post results were also reviewed.
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Demicha
05-19-2025, 11:54 PM #4

I checked the CPU-Z SPD tab for speed details, JEDEC timings, XMP settings, voltages, and memory information. The post results were also reviewed.

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MikaCupcake
Member
71
05-19-2025, 11:54 PM
#5
scout_03 :
what information do you have in cpu-z spd tab regarding speed and jedec timings for xmp speed and voltages? Also, check the memory tab and post result back. Sorry, I updated the post with previews at your request.
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MikaCupcake
05-19-2025, 11:54 PM #5

scout_03 :
what information do you have in cpu-z spd tab regarding speed and jedec timings for xmp speed and voltages? Also, check the memory tab and post result back. Sorry, I updated the post with previews at your request.

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Echopig987
Junior Member
4
05-19-2025, 11:54 PM
#6
volkgren :
I don't think DDR3 operates at 1200MHz. You need to consider the Double Data Rate (DDR). Two 1200MHz equals 2400MHz.
There seems to be no attachment here.
Sorry, I'm not clear on the point you're trying to convey — this set of DDR3 Corsair Vengeance pro comes as two 8GB sticks, intended for 2400MHz, though that's halved per stick?
Updated the post with the readings.
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Echopig987
05-19-2025, 11:54 PM #6

volkgren :
I don't think DDR3 operates at 1200MHz. You need to consider the Double Data Rate (DDR). Two 1200MHz equals 2400MHz.
There seems to be no attachment here.
Sorry, I'm not clear on the point you're trying to convey — this set of DDR3 Corsair Vengeance pro comes as two 8GB sticks, intended for 2400MHz, though that's halved per stick?
Updated the post with the readings.

A
aka00pikachu
Member
69
05-19-2025, 11:55 PM
#7
the reading is fine, you should double the result to achieve a ram speed of 2400. this meat the xmp jedec configurations are needed.
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aka00pikachu
05-19-2025, 11:55 PM #7

the reading is fine, you should double the result to achieve a ram speed of 2400. this meat the xmp jedec configurations are needed.

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ErikmitK
Junior Member
11
05-19-2025, 11:55 PM
#8
Giulio_2 :
volkgren :
I don't think DDR3 runs at 1200MHz.
You have to factor the Double Data Rate (DDR).
2x 1200MHz = 2400.
I don't see any attachment.
I am sorry I don't understand the point you're trying to make - this set of DDR3 Corsair Vengeance pro comes as 2 sticks of 8GB is designed to run at 2400MHz - albeit that is divided by two for each stick right?
Updated the post with the readings.
I'm saying your RAM is running at DDR4 2400 because the Double Data Rate transfers data on both the On and OFF of 1200MHz, so it is effectively 2400MHz. But when software reads the speed it reads 1200MHz which is normal.
1Hz is one on/off cycle. But since DDR transfers data on both the ON and the OFF of one cycle, it transfers data at twice the frequency.
So in a way I was wrong. It runs at 1200MHz but in DDR it is 2400.
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ErikmitK
05-19-2025, 11:55 PM #8

Giulio_2 :
volkgren :
I don't think DDR3 runs at 1200MHz.
You have to factor the Double Data Rate (DDR).
2x 1200MHz = 2400.
I don't see any attachment.
I am sorry I don't understand the point you're trying to make - this set of DDR3 Corsair Vengeance pro comes as 2 sticks of 8GB is designed to run at 2400MHz - albeit that is divided by two for each stick right?
Updated the post with the readings.
I'm saying your RAM is running at DDR4 2400 because the Double Data Rate transfers data on both the On and OFF of 1200MHz, so it is effectively 2400MHz. But when software reads the speed it reads 1200MHz which is normal.
1Hz is one on/off cycle. But since DDR transfers data on both the ON and the OFF of one cycle, it transfers data at twice the frequency.
So in a way I was wrong. It runs at 1200MHz but in DDR it is 2400.

R
renliff
Member
240
05-19-2025, 11:55 PM
#9
the reading is fine, you should double the result to get 2400 in RAM speed. This is the xmp jedec settings for it.
Is this correct? The issue is that one of the cores crashes after an hour of Torture test from Prime95.
So I think I need to make a change?
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renliff
05-19-2025, 11:55 PM #9

the reading is fine, you should double the result to get 2400 in RAM speed. This is the xmp jedec settings for it.
Is this correct? The issue is that one of the cores crashes after an hour of Torture test from Prime95.
So I think I need to make a change?

T
Torch15
Member
65
05-19-2025, 11:55 PM
#10
When you push the CPU to its maximum speed, lowering it afterward without crashes on Prime95 can help. Use hwinfo sensor to monitor temperature and core speed during this process.
T
Torch15
05-19-2025, 11:55 PM #10

When you push the CPU to its maximum speed, lowering it afterward without crashes on Prime95 can help. Use hwinfo sensor to monitor temperature and core speed during this process.