Aspire 5738Z memory is 1066 Mhz but running at 798 MHz?

THX1138 · February 2017

My Aspire 5738Z laptop has memory that is 533 or 1066 MHz (DDR3) but is currently running at 399 or 798 MHz. There are no options in the BIOS to adjust this. How do I fix it so the memory runs at its rated speed? Thanks.

The first ten digits of my serial number are LXPAR0X077.

I currently have Win 10 installed but may go back to Win 7 soon. I don't think that really matters though.

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brummyfan2 · February 2017

Hi,Yes, sorry I mistyped Core speed instead of FSB Smiley Embarassed You don't need to update the BIOS, FSB will be handled by the CPU and Chipset, no the FSB is fixed for the CPU by the manufacturers Smiley Sad

http://www.cpu-upgrade.com/CPUs/Intel/Pentium_Dual-Core_Mobile/T4200.html

http://forum.notebookreview.com/threads/aspire-5738zg-cpu-upgrade-options.496527/page-2

JackE · February 2017

Your speed monitor program may not be testing your system's full capabilities. Try another monitor. Jack E/NJ

brummyfan2 · February 2017

Hi,

You could also check them individually by removing one stick and check the speed, replace the other and check again to see whether any of them faulty.

THX1138 · February 2017

Unfortunately, the information from CPU-Z is corroborated by SiSoft Sandra:

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THX1138 · February 2017

Thanks for your response. Unfortunately, the problem persists when the SODIMMS are connected indivually in either slow and also when inserting another SODIMM rated at 577 (1333) MHz. They all seem to operate at 399/400 (800) MHz.

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brummyfan2 · February 2017

Hi,

Go to CPU tab in CPU-z and see what core speed it shows, your DRAM Frequency will be same, I have attached mine for you to compare. If you want to get your memory to work at 1066MHz, you need to upgrade your CPU.

JackE · February 2017

>>>the problem persists >>>

I really don't think you have a problem. While your RAM may be capable of operating at higher speeds, your bus & CPU may not. Jack E/NJ

THX1138 · February 2017

Thanks. My max core speed is ~2 GHz and rated FSB is 800 MHz but these vary according to demand. Can't I just set an appropriate FSB Smiley Very Happy RAM multiplier? I was hoping to upgrade the CPU soon but without propper BIOS settings, I don't think it will make a difference to the DRAM speed.

brummyfan2 · February 2017

Hi,Yes, sorry I mistyped Core speed instead of FSB Smiley Embarassed You don't need to update the BIOS, FSB will be handled by the CPU and Chipset, no the FSB is fixed for the CPU by the manufacturers Smiley Sad

http://www.cpu-upgrade.com/CPUs/Intel/Pentium_Dual-Core_Mobile/T4200.html

http://forum.notebookreview.com/threads/aspire-5738zg-cpu-upgrade-options.496527/page-2

THX1138 · February 2017

Okay, thanks. I'm going to try the T9900 and T9600 processors. The T9900 probably won't work but I read a forum thread that said someone did sucessfully use a T9600 processor in a 5738Z laptop. Thanks again.