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Here's what Jim Cramer had to say about some of the stocks that callers offered up during the "Mad Money Lightning Round" Wednesday evening:

Nvidia ( NVDA): "We want to own Nvidia. ... Fastest gaming chips, the best ones. You buy some. If it comes in, you buy some more. ... Nvidia is two thumbs up."

Dynegy ( DYN): "Reports this week. ... We like Dynegy as an asset play, not as an earnings play. We think that the power plants are worth a lot more than they're selling for. ...We like CEO Bruce Williamson."

Spectranetics ( SPNC): "Medical device company that I like. ... That group is hot. ... There are so many that are still down, but Spectranetics is a good, quality company."

Perfect World ( PWRD): "If I'm gonna do China, I'm gonna do China Tel ( CHA) and Baidu ( BIDU), and everything else, I'm letting some other guy handle it."

Nymex ( NMX): "Very valuable institution that I believe somebody would buy. ... Earnings are unbelievable. ... I wanna own your stock. The fact that it was up really big today is not enough to make me feel like we should ring the register yet."

Teck Cominco ( TCK): "A lot of the resource stocks have come down. I like the stock very much."

Lockheed Martin ( LMT): "Lockheed Martin, General Dynamics ( GD), Raytheon ( RTN), Northrop Grumman ( NOC). All under pressure right now. ... The stocks are bluffing. ... I want to buy the defense stocks here. I think it's a terrific opportunity. Don't take your cue from the stocks. Take your cue from the companies, and Lockheed Martin is doing incredibly well."

Ralcorp Holdings ( RAH): "It did have a spike, and it's been under pressure. ... I liked it before, and I like it now."

RealNetworks ( RNWK): "You gotta sell that stock now. ... No thank you."

ENGlobal ( ENG): "This is a buy. The group has gotten beleaguered," Cramer said, but "I'm stepping up here right now. ... It's right."

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At the time of publication, Cramer had no positions in stocks mentioned.

Jim Cramer, host of the CNBC television program "Mad Money," is a Markets Commentator for TheStreet.com, Inc., and CNBC, and a director and co-founder of TheStreet.com. All opinions expressed by Mr. Cramer on "Mad Money" are his own and do not reflect the opinions of TheStreet.com or its affiliates, or CNBC, NBC UNIVERSAL or their parent company or affiliates. Mr. Cramer's opinions are based upon information he considers to be reliable, but neither TheStreet.com, nor CNBC, nor either of their affiliates and/or subsidiaries warrant its completeness or accuracy, and it should not be relied upon as such. Mr. Cramer's statements are based on his opinions at the time statements are made, and are subject to change without notice. No part of Mr. Cramer's compensation from CNBC or TheStreet.com is related to the specific opinions expressed by him on "Mad Money."

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