I applied about a year ago by myself no co-signer and got approved for 13k (i do have very good credit though). Like the previous poster said they'll just look at your credit history based on your ssn, i suggest you at least check your credit on creditkarma.com before applying
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Sent -
8/20/12 to Phoenix USPS express delivered 8/21/12
G-1145 Notification:
8/27/12 routed to Cali
Date of I-797 C Notice of Action (Application Approved) -
8/29/12
Date Biometrics -
Done 9/10/12
EAD APPROVED-
09/18/2012: SSN received -
10/6/12