Info on PS2 SCPH30002R Mod Chip???

[phoenixone]

Good day there,

Hi names Lou my son Kyle has just bought a second hand PS2 Model SCPH 3000 2R it came with a boot disk it has Dvd regionx for use on European consoles on the cover.
It will boot up amost 95% of backup games but lately it has trouble loading New games such as Stuntman ,Shox ,Contra Shattered Soldier,and PS1 Firebugs.

Looking for info i found out this is a Japanese console.

I haven't opened it up but i'm wondering if this console has to have a mod chip in it to play back ups even with the mentioned boot disk.
Also another important question can i fit in another mod chip like the Messiah in this model.
If not what mod chip would you suggest to install to be able to boot all back ups.

Looking forward to an answer to my dilemma

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