did you try play around in bios? normally reserve memory are use for extra buffer for process to use for example. just let it run by default. 250mb.. its not that much.

win 11.. min 8gb... baseline 16gb... best 32gb i believe..

thanks a lot for the explanation.

actually the price of the 2400MHz and 2133MHz is the same at rm71 for the shoppe shop i bought from.
in fact 2133MHz, 2400MHz, 2666MHz all same price at rm71 while 3200MHz is only rm1 more at rm72.

1) that's why i am kind of regret now not to buy the higher speed one. it is stated that my motherboard can support up to 2400MHz of RAM, so my question is that if I put in a 3200MHz ram, will it even recognise but work at lower speed of 2400MHz? or it will just simply not working at all?

2) understood that 2400MHz vs 2133MHz the improvement will be minor. since my old ram does not support XMP, if i buy another 2133MHz ram now that supports XMP like the new one i bought. how much performance more i can probably get by doing so?

3) yeah, you are rite, RAM hardly fail. probably my motherboard spoiled first before it failed. in fact, my motherboard was having problem just 2 weeks back which it cannot be powered on. i brought to a computer shop to fix it at the price of rm100. luckily it can be fixed, else i may need to change a new motherboard which will certainly cost much more.
so kingston RAM is actually lifetime warranty? but i suppose if kingston no longer sells my model of ram, even it has lifetime warranty, it is not going to help in this case rite? which means they will not replace a RAM for me?

4) besides, may i know if there is any other brand that is better than kingston but at similar or just slightly higher pricing also that can be considered?

i bought from a shopee buyer and they said they give local warranty (1 year).
price i paid is RM65.90 including shipping with all the discounts (vouchers).
noticed that the model is no longer selling officially as it is old. but the item i received looks brand new maybe this is the old stock.

is the price above 'normal' or 'reasonable' price for the model and brand of RAM i bought?

i think i will just stick to the current setup. anyway, my PC is old already. no point to spend further $$ on it.

I upgrade to 16GB from the previous 8GB because I tot that it may help in performance but so far i realise my use case may not be able to utilise much on the extra 8GB.

but it is noticed that the shared GPU ram now shows only 8GB. could not remember the amount before i upraded to 16GB. but i guess it means the shared GPU never increase even the RAM is 16GB now. probably this is the limitation of the graphic card that it only utilises 8GB out of the available 16GB.

ic. so i guess it is the hardware limitation of the graphic card that it can only utilise up to 8GB from 50% of the shared RAM pool.

anyway, given the price of the RAM, i think it is refurbished one. although the seller told me it is brand new. 
appearance wise it looks brand new though. no scratches etc.

this one? it means it is manufactured in week 18 year 2023?
how come there is no serial no. 

bought from shopee buyer. not sure.

anyone can confirm? it has no serial no as well.

but on the kingston website i found this datasheet that matches the part no of the new ram i bought from shopee.

does it in any case shows some chance that the ram is not fake?

https://www.kingston.com/dataSheets/HX421C14FB2_8.pdf

Being so old i guess it could be oxidation. Have you tried rubbing the pins as 'Muusyc' shared?