I just got a used GP70+ (YP-GB70D) and it has 1 GB RAM.
I am quite disappointed with it - the major problem is the Adobe Flash performance of videos played in the web browser.
The GP70+ has flash 10.3 installed. Since Flash player is no longer available in Google Play, I use backup copies from my other phones and tablets and .apks from apktop. Flash 11 does NOT work - either causes force closes, or start playing and freezes. I installed the last version of Flash 10 before 11 (10.3.186.7), and it can only play up to 480p video - NO HD Flash, that completely freezes.
This is really unacceptable for a dual core OMAP4430 device. My GP5.0 and the Galaxy S phone has a single core Hummingbird CPU. It has Flash 11.1 and can play up to 720p Flash video in the browser.
The device also feels a little sluggish for a dual core tablet, even when using GO Launcher. It has a 800 x 480 screen, which is lower resolution than eg. Kindle Fire (which also has OMAP4430), the GPU drives fewer pixels and everything should be faster.
One big plus is that 1080p STORED videos (MP4, DIVX) play flawlessly with MX player - MX player shows that hardware decoding is enabled. HW acceleration is NOT supported in the single core GP5.0, and it can only play up to 720p (some not all, depending on bitrate).
P.S. By the way, if any GP70+ owners want a copy of the rooted firmware of this player (GB70KRLD2), please post your request here or PM me (I don't want the upload link to be killed quickly). I searched high and low and finally found it in a Chinese forum (Google Translate saves the day!). Thank goodness it was still good for download.