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Up Topic Rybka Support & Discussion / Rybka Discussion / Enough RAM for Rybka ?
- - By ssace (**) Date 2009-10-12 01:46
I have Intel Q6600 with 2 Gigs of RAM.  I plan to upgrade to Windows 7 x64 soon.

How much Ram should I have to efficiently use Rybka 3 MP version?
Parent - By ssace (**) Date 2009-10-12 02:07
Sry, similar thread starter here that answers my questions...
http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?tid=12833
Parent - - By Eagleclaww (***) Date 2009-10-12 02:34
I'll admit I haven't exactly been keeping up to date on memory reqs of chess programs, but historically, the greatest amount of ram was used be a hash table, and in that respect, usually a well tuned hash table can have faster, better results than a "kitchen sink" hash table. I think 128 to 255 megs of ram for a hash table is more than enough.

Back in the day, people would debate what was better: 32k, 64k, 128k, or 256k hash tables. I think 128k won the contest. Of course, thats going back many years. Nowadays, computers are fast enough and calculate enough variations that 64 meg to 256 meg hash tables are more common.

Don't know much about chess engines, but I'd imagine at today's speeds, a computer could just recalculate a 128k hash table in less time than it would take to look the table up in RAM.

AHHH, that brings back memories. My first computer has a whopping 64k RAM, and a friend of mine had a computer that topped out at 32k. OUCH.

Course, in the 80's and early 90's, stand alone chess computers were all the rage. I even remember once seeing an advertisement in Chess Life for an expansion card for a PC that was specifically designed to play chess. (Think it was under the Mephisto brand). Back when it was a major selling point for a stand alone chess computer to proudly proclaim 64k, or even 128k hash tables.

Those stand alone chess computers actually played some decent chess. Think the top end Mephisto Chess Table had 128k hash table and played around 2200. Not too shabby. And unlike today's chess program.. it actually played at a USCF rating of 2200.
-Not to rag on chess programs like Chessmaster XI or whatever, but when you set it at a particular "rating", its actual strength can vary wildly from one game to the next. Also, its not a true rating, but just an estimate based on playing other chess engines set to a level thats suppose to approximate a given strength.

Of course, if you set Chessmaster to at least 2200, it will better approximate an actual masters level player. But definately I've seen it do some obvious tactical mistakes at the 1800 level, although not every game.
Parent - By Uly (Gold) Date 2009-10-12 08:41
I use 64MB* for the hash and haven't seen any clear improvement for going higher, though ssace may want to get 4GB to give Rybka 2GB if he plans to let the computer analyze for days to depth 27 or higher...

*) Though Rybka uses much more than specified due to a bug anyway.
Up Topic Rybka Support & Discussion / Rybka Discussion / Enough RAM for Rybka ?

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