• Welcome to TechPowerUp Forums, Guest! Please check out our forum guidelines for info related to our community.

Are my RAMs really running at 800 MHz ?

Joined
Jun 3, 2018
Messages
540 (2.29/day)
Likes
176
Location
Jeddah , Saudi Arabia.
System Name POTATO
Processor Core 2 Duo E7600 @ 3.38 GHz stock voltage
Motherboard GA-945GCM-S2C
Cooling Intel stock cooler
Memory 3 GB DDR2 800 MHz @ 745 MHz
Video Card(s) Asus GTX 750 TI FML OC 2GB
Storage Western Digital 500 GB 7.2K RPM (5000AAKX) + Western Digital 200 GB 7.2K RPM (2000 JS)
Display(s) Samsung E1920
Case Unbranded , Mini tower
Audio Device(s) Creative inspire 4.1 4400
Power Supply Microdigit MD2111P , unknown wattage!(probably around 400-500W)+Buying this thing was a huge mistake
Mouse Genius NetScroll 120
Keyboard HP SK-2885
Software Windows 10 Enterprise 32 bit
#1
Hello guys , this question has been in my head for a really long time , my RAMs are 800 MHz , and my motherboard supports up to 667 MHz , so my RAMs are running at 667 MHz , but when i OC my CPU , i can see that RAM frequency passes 667 MHz ! , for example if i set FSB to 320 it says that RAM frequency is 800 MHz , even in CPU-Z it says DRAM frequency 400 MHz , how is this possible? i mean my board supports up to 667 MHz.

And btw the task manager says 667 MHz.
 
Joined
Aug 6, 2017
Messages
2,950 (5.50/day)
Likes
1,823
Location
Poland
System Name skurwiel szatan
Processor i7 5775c OC:4.3/1.385v/EDRAM @2GHz Power save: 3.3/1.06v
Motherboard Z97X Gaming 5
Cooling Noctua D15S
Memory Crucial Ballistix Tactical VLP 1600 CL8 1.35v OC @2400 CL10 1.6v
Video Card(s) MSI GTX 1080 Ti Gaming X Trio 2GHz
Storage SU900 128 (OS),850 Pro 256+256+ 512+860 Evo 500 (games),4TB of HDDs (3+1)
Display(s) Acer XB241YU+Dell S2716DG dual monitor setup
Case Full tower
Audio Device(s) Mad Catz FREQ wireless
Power Supply Superflower Leadex Gold 850W
Mouse G403 wireless + Steelseries DeX + Roccat rest
Keyboard Razer Deathstalker
Software Windows 10
Benchmark Scores A LOT
#2
Last edited:
Joined
Jun 3, 2018
Messages
540 (2.29/day)
Likes
176
Location
Jeddah , Saudi Arabia.
System Name POTATO
Processor Core 2 Duo E7600 @ 3.38 GHz stock voltage
Motherboard GA-945GCM-S2C
Cooling Intel stock cooler
Memory 3 GB DDR2 800 MHz @ 745 MHz
Video Card(s) Asus GTX 750 TI FML OC 2GB
Storage Western Digital 500 GB 7.2K RPM (5000AAKX) + Western Digital 200 GB 7.2K RPM (2000 JS)
Display(s) Samsung E1920
Case Unbranded , Mini tower
Audio Device(s) Creative inspire 4.1 4400
Power Supply Microdigit MD2111P , unknown wattage!(probably around 400-500W)+Buying this thing was a huge mistake
Mouse Genius NetScroll 120
Keyboard HP SK-2885
Software Windows 10 Enterprise 32 bit
#3
if you've overclocked the fsb by 20% (266 to 320,1066 to 1280 effectively in qdr) your ram speed should increase by 20% (667 to 800). You can change it back to 667 by choosing a lower fsb to dram ratio.
Yeah i know that but i thought my board can't give more than 667 MHz.

hwinfo says 400 MHz like CPU-Z.
 
Joined
Aug 29, 2005
Messages
4,997 (1.02/day)
Likes
1,679
Location
Whatever my internet protocol shows I guess O.o
System Name Lynni and The Great White Dragon in Tempered Glass | Lynni-Stick
Processor Intel Core i7-8086K (Coffee Cups) | Intel Atom X5-Z8300 "Cherry Trail"
Motherboard ASRock Z370 Taichi (Bios: P3.20 Disabled Intel ME modded by R-T-B) | Intel Compute Stick board
Cooling Fractal Design Celsius S24 | Fan xD
Memory Geil Dragon 2x8GB@3000mhz 15-17-17-35 (GWW416GB3000C15DC) | 2GB DDR3-L @ 1600mhz
Video Card(s) Nvidia GTX 1080 Ti FE "Pascal" Hybrid Core/Mem: +100MHz | Intel HD Graphics
Storage OS/Games:Samsung 970 EVO 500GB NVME|Samsung EVO 850 1TB SSD|Data:3xWD Red/Purple 4TB & WD SE 1TB
Display(s) Dell S2417DG 1440p@165hz G-Sync | Philips 50PFT4009/12
Case Phantek Eclipse P400 Black/White | Intel Compute Case
Audio Device(s) Audio-Technica A550Z @ Creative Sound Blaster Z (Retail) | Intel HD Audio
Power Supply Corsair SF600 | Generic Intel Power Adapter (3amp)
Mouse Logitech G502 | Logtech MK270 kit
Keyboard Razer Blackwidow Chroma X UK | Logitech MK270 kit
Software Win10 Pro SCU UK x64 | Win10 Home SCU x86
Benchmark Scores Time Spy: https://www.3dmark.com/3dm/32609156?
#4
Yeah i know that but i thought my board can't give more than 667 MHz.

hwinfo says 400 MHz like CPU-Z.
U have to x2 that same goes for my DDR4 3000mhz ram, they run 1500.4MHz according to CPU-Z and in Bios 300MHz with X.M.P. Profile.
 

Aquinus

Resident Wat-man
Joined
Jan 28, 2012
Messages
11,021 (4.32/day)
Likes
6,185
Location
Concord, NH
System Name Kratos
Processor Intel Core i7 3930k @ 4.5Ghz
Motherboard ASUS P9X79 Deluxe
Cooling Corsair H100i V2
Memory G.Skill DDR3-2133, 16gb (4x4gb) @ 9-11-10-28-108-1T 1.65v
Video Card(s) Sapphire AMD Radeon RX Vega 64
Storage 2x120Gb SATA3 SSD Raid-0, 4x1Tb RAID-5, 1x500GB, 1x512GB Samsung 960 Pro NVMe
Display(s) 1x LG 27UD69P (4k), 2x Dell S2340M (1080p)
Case Antec 1200
Audio Device(s) Onboard Realtek® ALC898 8-Channel High Definition Audio
Power Supply Seasonic 1000-watt 80 PLUS Platinum
Mouse Logitech G602
Keyboard Rosewill RK-9100
Software Ubuntu 18.04 (5.0-rc2 Mainline Kernel)
Benchmark Scores Benchmarks aren't everything.
#5
Yeah i know that but i thought my board can't give more than 667 MHz.

hwinfo says 400 MHz like CPU-Z.
The highest supported memory multiplier at stock is 667Mhz. When you overclock the base clock you're overclocking the input clock going into the memory controller (in your case the MCH.) At stock, the FSB is ~266.5Mhz so 667Mhz is had my multiplying the base clock. What you're seeing is the effective memory clock which is actually twice as fast as the actual clock since data is sent on both rising and falling edges of the memory clock. So your 667Mhz memory is actually running at 333.5Mhz (multiplied by 2 gets you your 667.) So, for your machine, the multiplier at 667Mhz is 5:4 (or 1.25.)

So 266.5Mhz * 5:4 = 333.1Mhz (which is 666.2Mhz effective.)
If you increase the core clock without altering the memory multiplier, the base clock changes but, the multiplier stays the same:
So 320Mhz * 5:4 = 400Mhz (which is 800Mhz effective.)

When the motherboard says it only supports 667Mhz memory, it means at stock settings with the highest supported memory multiplier. It says nothing about the core clock being bound to prevent changes to the memory clock. It's just that you can't use a multiplier higher than 5:4.
 
Joined
Jun 3, 2018
Messages
540 (2.29/day)
Likes
176
Location
Jeddah , Saudi Arabia.
System Name POTATO
Processor Core 2 Duo E7600 @ 3.38 GHz stock voltage
Motherboard GA-945GCM-S2C
Cooling Intel stock cooler
Memory 3 GB DDR2 800 MHz @ 745 MHz
Video Card(s) Asus GTX 750 TI FML OC 2GB
Storage Western Digital 500 GB 7.2K RPM (5000AAKX) + Western Digital 200 GB 7.2K RPM (2000 JS)
Display(s) Samsung E1920
Case Unbranded , Mini tower
Audio Device(s) Creative inspire 4.1 4400
Power Supply Microdigit MD2111P , unknown wattage!(probably around 400-500W)+Buying this thing was a huge mistake
Mouse Genius NetScroll 120
Keyboard HP SK-2885
Software Windows 10 Enterprise 32 bit
#6
The highest supported memory multiplier at stock is 667Mhz. When you overclock the base clock you're overclocking the input clock going into the memory controller (in your case the MCH.) At stock, the FSB is ~266.5Mhz so 667Mhz is had my multiplying the base clock. What you're seeing is the effective memory clock which is actually twice as fast as the actual clock since data is sent on both rising and falling edges of the memory clock. So your 667Mhz memory is actually running at 333.5Mhz (multiplied by 2 gets you your 667.) So, for your machine, the multiplier at 667Mhz is 5:4 (or 1.25.)

So 266.5Mhz * 5:4 = 333.1Mhz (which is 666.2Mhz effective.)
If you increase the core clock without altering the memory multiplier, the base clock changes but, the multiplier stays the same:
So 320Mhz * 5:4 = 400Mhz (which is 800Mhz effective.)

When the motherboard says it only supports 667Mhz memory, it means at stock settings with the highest supported memory multiplier. It says nothing about the core clock being bound to prevent changes to the memory clock. It's just that you can't use a multiplier higher than 5:4.
Thanks dude:love:.
 
Top