Look up blue jeans cables. Yes the new slim needs a slightly better cable but this is NO ASSURANCE it will fix this. Sorry.
I bought a new slim Sony Ps3 250 gb model. The hdmi port was shutting down every few minutes, so I called Sony. Sony asked me what kind of cable it was. I assured him that I took the cable from another HDMI device where it had been working fine. He told me to buy a Sony cable to fix my HDMI issues. I will be forced to buy a very costly Sony HDMI cable to prove that he is wrong. I may also prove that he is right too. if the new Sony cable does fix my problem, I am going to have a new opinion of Monoprice cables.
I was of the mindset that a digital signal was either good enough, or not good enough. I get good video on my WDTV with the monoprice cable.
I will try to update when I get the Sony HDMI cable and test it on my PS3.