The Core i5-2300 and i3-2100 both have the Intel HD 2000 graphics core. Only the "k" models have the faster Intel HD 3000; such as the i5-2500k and i7-2600k. The Intel HD 2000 graphics core is roughly 20% - 33% slower than the Intel HD 3000. These CPU are for desktop computers, not laptops.
The Intel HD 3000 graphics core is overall slightly faster than the desktop Radeon HD 5450 which is the slowest Radeon HD 5xxx card and is not considered a gaming card.
Short answer, the Intel HD 2000, Intel HD 3000, and Radeon HD 5450 are only good for low resolution and low graphics quality. Minimum card for decent performance (decent, not good) with medium quality graphics is the HD 5670 for resolutions up to 1920 x 1200 which can be found for around $65 after rebate.
See following review which includes benchmarks of the Radeon HD 5450 and HD 5670 along with other cards. Note that the test rig used for the review has an Intel Core i7 920 @ 3.8 GHz.
http/www.techpowerup.com/reviews/Zotac/GeForce_GT_430/1.html