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I have 4GB DDR3 1600MHz Ram in my laptop(Dell Vostro). I bought another 4GB DDR3 1600MHz Ram and put it to my laptop.
Now my laptop shows 8GB Ram as expected. But it show 1333MHz. Why is that? How to fix it?
Damith
Posted 2020-02-11T04:30:31.660
Reputation: 1
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Clock speed is not the only important memory "speed" you need to look at when buying memory to go with old sticks.
If you do not have a matched pair of DIMMs then they may have different memory timings (CAS, RAS, etc), as a result your memory controller may have to work to a "highest common settings" at a lower frequency.
It is often best to get a DIMM that as closely matches the make and model of your existing set in order to ensure they are 100% compatible.
That said, if your machine was in single channel and is now dual then 2 x 1333 (2666) will still be faster than 1 x 1600. Memory accesses should still be effectively faster.
Im sure at one point I have seen machines which listed both a maximum memory speed as well as a maximum "fully populated" memory speed. I can't find the source where I read that caveat at the moment.
Mokubai
Posted 2020-02-11T04:30:31.660
Reputation: 64 434
That said, if your machine was in single channel and is now dual then 2 x 1333 (2666) will still be faster than 1 x 1600. Memory accesses should still be effectively faster. Which means, it is better having two 4GB 1600MHz (because *2= 3200Mhz) Rams than one 8GB 1600mHz Ram. – Damith – 2020-02-11T09:09:44.457
@Damith yes, dual channel will result in higher peak bandwidth than single channel. I would prefer a slightly lower clocked dual channel over single channel. 2 DIMMs are better than 1. – Mokubai – 2020-02-11T09:25:11.987
@Damith you can use CPU-z (https://www.cpuid.com/softwares/cpu-z.html) and check the memory tab, it should tell you the memory configuration (single or dual) as well as other details of the memory modules itself.
– Mokubai – 2020-02-11T09:31:08.710
Model of laptop? – Appleoddity – 2020-02-11T04:48:19.337
@Appleoddity Dell Vostro 3559 – Damith – 2020-02-11T05:33:26.327
Where does it show this? How do we know what you are looking at? – Mark – 2020-02-11T07:35:50.260
@Mark It is showing in Task Manger -> Performance Tab – Damith – 2020-02-11T09:11:50.390
1@Mark if you click the memory meter on the performance tab it will bring up a larger memory graph in the main window area. Below the two graphs there on the right hand side will be "Speed:" as well as slots used. – Mokubai – 2020-02-11T12:09:57.097
@Mark Even you write a wrong comment, don't delete it. People don't know everything. It is totally fine. Next time, don't delete comments. – Damith – 2020-02-12T02:41:31.473