UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

(Rule 13d-101)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT

TO § 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO

§ 240.13d-2(a)

(Amendment No. 1)1

PLX Technology, Inc.

(Name of Issuer)

Common Stock,  $.001 per share

(Title of Class of Securities)

693417107

(CUSIP Number)

Paul J. Solit

Eric Singer

POTOMAC CAPITAL PARTNERS II, L.P.

825 Third Avenue, 33rd Floor

New York, New York 10022

With copies to:

Steve Wolosky, Esq.

OLSHAN FROME WOLOSKY LLP

Park Avenue Tower

65 East 55th Street

New York, New York 10022

(212) 451-2300

(Name, Address and Telephone Number of Person

Authorized to Receive Notices and Communications)

February 13, 2013

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box ¨.

Note:  Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits.  See § 240.13d-7 for other parties to whom copies are to be sent.

_______________

1              The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP NO. 693417107

1	NAME OF REPORTING PERSON POTOMAC CAPITAL PARTNERS II, L.P.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS WC, OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER - 0 -
	8	SHARED VOTING POWER 1,391,757
	9	SOLE DISPOSITIVE POWER - 0 -
	10	SHARED DISPOSITIVE POWER 1,391,757
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,391,757
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 3.1%
14	TYPE OF REPORTING PERSON PN

2

CUSIP NO. 693417107

1	NAME OF REPORTING PERSON POTOMAC CAPITAL MANAGEMENT II, L.L.C.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS AF
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER - 0 -
	8	SHARED VOTING POWER 1,391,757
	9	SOLE DISPOSITIVE POWER - 0 -
	10	SHARED DISPOSITIVE POWER 1,391,757
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,391,757
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 3.1%
14	TYPE OF REPORTING PERSON OO

3

CUSIP NO. 693417107

1	NAME OF REPORTING PERSON POTOMAC CAPITAL PARTNERS III, L.P.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS WC, OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER - 0 -
	8	SHARED VOTING POWER 115,749
	9	SOLE DISPOSITIVE POWER - 0 -
	10	SHARED DISPOSITIVE POWER 115,749
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 115,749
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) Less than 1%
14	TYPE OF REPORTING PERSON PN

4

CUSIP NO. 693417107

1	NAME OF REPORTING PERSON POTOMAC CAPITAL MANAGEMENT III, L.L.C.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS AF
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER - 0 -
	8	SHARED VOTING POWER 115,749
	9	SOLE DISPOSITIVE POWER - 0 -
	10	SHARED DISPOSITIVE POWER 115,749
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 115,749
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) Less than 1%
14	TYPE OF REPORTING PERSON OO

5

CUSIP NO. 693417107

1	NAME OF REPORTING PERSON POTOMAC CAPITAL PARTNERS L.P.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS WC
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER - 0 -
	8	SHARED VOTING POWER 808,739
	9	SOLE DISPOSITIVE POWER - 0 -
	10	SHARED DISPOSITIVE POWER 808,739
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 808,739
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 1.8%
14	TYPE OF REPORTING PERSON PN

6

CUSIP NO. 693417107

1	NAME OF REPORTING PERSON POTOMAC CAPITAL MANAGEMENT, L.L.C.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS AF
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER - 0 -
	8	SHARED VOTING POWER 808,739
	9	SOLE DISPOSITIVE POWER - 0 -
	10	SHARED DISPOSITIVE POWER 808,739
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 808,739
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 1.8%
14	TYPE OF REPORTING PERSON OO

7

CUSIP NO. 693417107

1	NAME OF REPORTING PERSON PAUL J. SOLIT
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS AF
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION USA
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER - 0 -
	8	SHARED VOTING POWER 2,316,245
	9	SOLE DISPOSITIVE POWER - 0 -
	10	SHARED DISPOSITIVE POWER 2,316,245
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,316,245
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 5.1%
14	TYPE OF REPORTING PERSON IN

8

CUSIP NO. 693417107

1	NAME OF REPORTING PERSON ERIC SINGER
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS AF
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION USA
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER - 0 -
	8	SHARED VOTING POWER 1,507,506
	9	SOLE DISPOSITIVE POWER - 0 -
	10	SHARED DISPOSITIVE POWER 1,507,506
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,507,506
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 3.3%
14	TYPE OF REPORTING PERSON IN

9

CUSIP NO. 693417107

The following constitutes Amendment No. 1 to the Schedule 13D filed by the undersigned (“Amendment No. 1”).  This Amendment No. 1 amends the Schedule 13D as specifically set forth herein.

Item 3. Source and Amount of Funds or Other Consideration.

Item 3 is hereby amended and restated as follow:

The aggregate purchase price of the 1,391,757 Shares owned directly by PCP II is approximately $6,106,220, including brokerage commissions.  The Shares owned directly by PCP II were acquired with its working capital.

The aggregate purchase price of the 115,749 Shares owned directly by PCP III is approximately $476,089, including brokerage commissions.  The Shares owned directly by PCP III were acquired with its working capital.

The aggregate purchase price of the 808,739 Shares owned directly by PCP is approximately $3,415,795, including brokerage commissions.  The Shares owned directly by PCP were acquired with its working capital.

PCP II, PCP III and PCP each effect purchases of securities primarily through margin accounts maintained for them with prime brokers, which may extend margin credit to them as and when required to open or carry positions in the margin accounts, subject to applicable federal margin regulations, stock exchange rules and the prime brokers’ credit policies.  In such instances, the positions held in the margin accounts are pledged as collateral security for the repayment of debit balances in the accounts.

Item 4. Purpose of Transaction.

Item 4 is hereby amended to add the following:

On February 13, 2013, the Reporting Persons delivered a second letter to the Board of Directors of the Issuer (the “Board”).  In the letter, the Reporting Persons expressed their grave disappointment with the Board’s failure to provide a meaningful response to the issues raised in their January 25, 2013 letter.  The letter noted that the response by David Raun, the newly appointed President and CEO of the Issuer, that he would meet with the Reporting Persons as part of management’s periodic meetings with investors regarding routine communications was disturbing.  The Reporting Persons pointed out that while Board members had excused themselves with having no time to meet immediately, the Board had found time to adopt shareholder unfriendly defenses to entrench themselves only four days after the filing of the Reporting Persons’ Schedule 13D.  The letter reiterated that value can best be created by capitalizing on the historic interest in the Issuer and exploring all available strategic alternatives, including the sale of the Issuer.  However, the Reporting Persons stressed they had no faith that the Board as currently composed will translate strategic interest in the Issuer into a value-maximizing transaction. The Reporting Persons concluded that change is needed in the composition of the Board. The full text of the letter is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Item 5. Interest in Securities of the Issuer.

Item 5(a) through 5(c) are hereby amended and restated as follows:

(a)      The aggregate percentage of Shares reported owned by each Reporting Person is based upon 45,061,030 Shares outstanding, which is the total number of Shares outstanding as of December 5, 2012 as reported in the Issuer’s Amendment No. 9 to Schedule TO, filed with the Securities and Exchange Commission on December 7, 2012.

10

CUSIP NO. 693417107

As of the close of business on February 12, 2013, PCP II beneficially owns 1,391,757 Shares, constituting approximately 3.1% of the Shares outstanding.  By virtue of their relationships with PCP II discussed in further detail in Item 2, each of Potomac Management II and Messrs. Solit and Singer may be deemed to beneficially own the Shares beneficially owned by PCP II.

As of the close of business on February 12, 2013, PCP III beneficially owns 115,749 Shares, constituting less than 1% of the Shares outstanding.  By virtue of their relationships with PCP III discussed in further detail in Item 2, each of Potomac Management III and Messrs. Solit and Singer may be deemed to beneficially own the Shares beneficially owned by PCP III.

As of the close of business on February 12, 2013, PCP beneficially owned 808,739 Shares, constituting approximately 1.8% of the Shares outstanding.  By virtue of their relationships with PCP discussed in further detail in Item 2, each of Potomac Management and Mr. Solit may be deemed to beneficially own the Shares beneficially owned by PCP.

(b)           PCP II, Potomac Management II and Messrs. Solit and Singer share the power to vote and dispose of the Shares beneficially owned by PCP II.  PCP III, Potomac Management III and Messrs. Solit and Singer share the power to vote and dispose of the Shares beneficially owned by PCP III.  PCP, Potomac Management and Mr. Solit share the power to vote and dispose of the Shares beneficially owned by PCP.

(c)           Schedule A annexed hereto lists all transactions in the Shares by the Reporting Persons since the filing of the Schedule 13D. All of such transactions were effected in the open market, except as otherwise noted.

Item 7. Material to be Filed as Exhibits.

Item 7 is hereby amended to add the following exhibit:

99.1 Letter to the Board dated February 13, 2013.

11

CUSIP NO. 693417107

SIGNATURES

After reasonable inquiry and to the best of his knowledge and belief, each of the undersigned certifies that the information set forth in this statement is true, complete and correct.

Dated:  February 13, 2013	POTOMAC CAPITAL PARTNERS II, L.P.
	By:	Potomac Capital Management II, L.L.C.
		General Partner
	By:	/s/ Paul J. Solit
	Name:	Paul J. Solit
	Title:	Co-Managing Member

POTOMAC CAPITAL MANAGEMENT II, L.L.C.
By:	/s/ Paul J. Solit
Name:	Paul J. Solit
Title:	Co-Managing Member

POTOMAC CAPITAL PARTNERS III, L.P.
By:	Potomac Capital Management III, L.L.C.
	General Partner
By:	/s/ Paul J. Solit
Name:	Paul J. Solit
Title:	Co-Managing Member

POTOMAC CAPITAL MANAGEMENT III,  L.L.C.
By:	/s/ Paul J. Solit
Name:	Paul J. Solit
Title:	Co-Managing Member

POTOMAC CAPITAL PARTNERS L.P.
By:	Potomac Capital Management, L.L.C.
	General Partner
By:	/s/ Paul J. Solit
Name:	Paul J. Solit
Title:	Managing Member

12

CUSIP NO. 693417107

POTOMAC CAPITAL MANAGEMENT, L.L.C.
By:	/s/ Paul J. Solit
Name:	Paul J. Solit
Title:	Managing Member

/s/ Paul J. Solit

PAUL J. SOLIT

/s/ Eric Singer

ERIC SINGER

13

CUSIP NO. 693417107

SCHEDULE A

Transactions in the Shares Since the Filing of the Schedule 13D

Shares of Common Stock Purchased/ (Sold) Price Per Share($) Date of Purchase/ Sale

POTOMAC CAPITAL PARTNERS II, L.P.

9,800 4.6500 01/28/13

POTOMAC CAPITAL MANAGEMENT II, L.L.C.

None

POTOMAC CAPITAL PARTNERS III, L.P.

None

POTOMAC CAPITAL MANAGEMENT III, L.L.C.

None

POTOMAC CAPITAL PARTNERS L.P.

1,000 4.5000 01/30/13

POTOMAC CAPITAL MANAGEMENT, L.L.C.

None

PAUL J. SOLIT

None

ERIC SINGER

None